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- ECON: ECONOMETRIC FORECASTING MODELS
-
- DC Econometrics
-
- Copyright 1989
-
-
- Table of Contents
-
- Software License
- Warranty
- 1. Introduction
- 2. Getting Started
- 2.1 Required Hardware
- 2.2 Making a Backup
- 2.3 Running the Program
- 3. Main Menu
- 3.1 Input Monthly Data
- 3.2 Econometric Forecasts
- 3.3 Play "WHAT IF" Games
- 3.4 Edit Files
- 3.5 Historical Forecasts
- 3.6 Adjust File to New Baseline
- 3.7 Exit the Program
- 3.8 Help
- 3.9 Printer Options
- 3.10 Print Registration Form
- 4. Using the Forecasts
- 5. The Econometric Models
- 5.1 Checking the forecasts
- 5.2 Details on the Regressions
- 6. Getting Help
- 6.1 Error messages
- 7. Recommended Reading
- 8. Placing an Order
-
-
- Software License
-
- Read this user agreement before using the software. By using the
- software, you agree to be bound by the following terms of the
- license and warranty.
-
- The econ software recorded on disk is copyrighted software of DC
- Econometrics, and all rights are reserved. DC Econometrics
- authorizes you to make archival copies of the software for the
- purpose of backing-up our software and protecting your investment
- from loss. You may give away copies of this shareware program to
- others and you may make it publicly available on bulletin board
- systems. You may not distribute copies of the output forecasts
- of the program without written permission from DC Econometrics.
-
- You agree that the liability of DC Econometrics, its affiliates,
- agents, and licensors, if any, arising out of any kind of legal
- claim (whether in contract, tort, or otherwise) in any way
- connected with the software shall not exceed the amount you paid
- to DC Econometrics for the software and documentation.
-
- Warranty
-
- DC Econometrics warrants the diskette and documentation provided
- upon registration to be free of physical defects in workmanship
- and materials for 90 days from date of registration. In the event
- of notification within the warranty period, DC Econometrics will
- replace the defective diskette or documentation.
-
- The remedy for breach of this warranty shall be limited to
- replacement and shall not encompass any other damages, including
- but not limited to loss of profit, and special, incidental,
- consequential, or other similar claims.
-
- DC Econometrics excludes and disclaims any and all other
- warranties expressed or implied, including but not limited to
- implied warranties of merchantability and fitness for a
- particular application.
-
- DC Econometrics and its affiliates cannot and do not warrant the
- accuracy, completeness, currentness, merchantability, or fitness
- for a particular purpose of its software or data. In no event
- will DC Econometrics, its affiliates, agents, or licensors be
- liable to you or anyone else for any decision made or action
- taken by you in reliance upon this software or its output. The
- entire risk as to its quality and performance is assumed by the
- purchaser. The purchaser relies on the software entirely on his
- own risk.
-
- In no event will DC Econometrics be liable for any loss of profit
- or any other commercial damage, including but not limited to
- special, incidental, consequential, or other damages. DC
- Econometrics and its affiliates are not responsible for any cost
- of recovering, reprogramming, or reproducing any program or data,
- or damages arising out of the use of this product, even if DC
- Econometrics has been advised of the possibility of such damages.
-
- This statement shall be construed, interpreted, and governed by
- the laws of the state of Colorado.
-
-
- 1. INTRODUCTION
-
- This program contains several econometric models to forecast the
- stock market, interest rates, and inflation. It forecasts all of
- them 3 months, 6 months, and 12 months in the future. There is
- also an asset allocation routine to calculate suggested
- portfolios.
-
- Once a month, you enter 8 numbers: stock prices, interest rates,
- CPI, unemployment, P/E ratio, and dividends. These are available
- from many sources, but I find Barron's most timely and
- convenient. The software stores the new numbers and uses its
- historical database to calculate predictions that you can use to
- find new Bull or Bear markets.
-
-
- 2. GETTING STARTED
-
- 2.1 Required Hardware
-
- The program is designed for IBM personal computers and
- compatibles with MS-DOS or PC-DOS 2.0 or above. It will work
- with IBM PC, XT, AT, and PS/2 machines. You also need 256K of
- internal memory and one 5 1/4 inch or 3 1/2 inch disk drive.
-
- IBM, AT, and XT are registered trademarks of International
- Business Machines Corp. MS-DOS is a registered trademark of
- Microsoft Corp.
-
- 2.2 Making a Backup
-
- Disks are fragile, so you should make a backup copy as soon as
- possible. Since the program stores historical data, you should
- make a backup copy every few months, rewriting the old backup.
- If you have a power failure while the program is writing data, a
- file could be lost.
-
- To make backup to floppy disk:
-
- 1. Boot up in MS-DOS
- 2. When you get the A> prompt type: diskcopy
-
- The DOS disk may need to be in the A drive
- if you have no hard disk. The computer will
- respond:
- Insert SOURCE diskette in drive A:
-
- 3. Insert the ECON disk and press any key
- 4. When it asks for TARGET disk, insert a blank
- diskette.
- 5. Verify that the following files are located on
- your TARGET disk:
-
- ECON.EXE UNEMP
- SP500 CPI
- TBILL SPPEM
- TBOND SPDIVM
- PRIME ISTYR
- ECON.TXT README.TXT
-
- To make backup to hard disk:
-
- 1. Boot up in MS-DOS
- 2. Put SOURCE diskette in drive A
- 3. Create a directory on the hard disk
- mkdir \econ
- 4. Copy files to hard disk
- copy a:*.* c:\econ
- 5. Verify that the following files are located in
- the directory:
-
- ECON.EXE UNEMP
- SP500 CPI
- TBILL SPPEM
- TBOND SPDIVM
- PRIME ISTYR
- ECON.TXT README.TXT
-
- 2.3 Running the Program
-
- 1. Boot up in MS-DOS
- 2. Insert the ECON disk into the floppy drive or
- move to the \econ directory (cd \econ)
- 3. Type: ECON (and press Enter)
- 4. The program will load, and the shareware
- message will come up. Press return. You
- will then see a list of options for output
- devices. I usually choose 1 for screen,
- or 2 for printer.
-
-
- 3. MAIN MENU
-
- The program reads in the historic data. This takes one minute.
- After the data is loaded, the main menu is displayed:
-
- 1. INPUT MONTHLY DATA
- 2. ECONOMETRIC FORECASTS
- 3. PLAY WHAT IF GAMES
- 4. EDIT FILES
- 5. HISTORICAL FORECASTS
- 6. ADJUST FILE TO NEW BASELINE
- 7. EXIT THE PROGRAM
- 8. HELP
- 9. PRINTER OPTIONS
- 10. PRINT REGISTRATION FORM
-
- You decide which choice you want, type its number (1 to 10) and
- press Enter. The next ten sections will describe the function of
- each choice.
-
-
- 3.1 Input Monthly Data
-
- Once a month, new data needs to be entered. I get this data from
- the first issue of Barron's available each month. Other sources
- may be used, however. Barron's is available on Mondays with
- numbers from the previous week, so if Friday was in the new
- month, I use those numbers. You only need 8 numbers. It is best
- to record them for future reference. A log sheet for this
- purpose is enclosed.
-
- You may subscribe to Barron's by writing to Barron's, 200 Burnett
- Road, Chicopee, MA 01021. Or call 1-800-328-6800, Ext 292.
-
- If you can't get the data for the first week in the month it is
- OK to use next week's numbers. Small changes do not affect the
- forecasts, but it's best to be consistent.
-
- The data is stored in ascii files so you can use them easily.
- The program stores 25 years of history. Every 5 years, on years
- ending in 0 and 5, the oldest 5 years of numbers are erased. So
- if you want to keep older data, archive a copy of the files soon.
-
- Here is an explanation of the 8 numbers you enter monthly:
-
- S&P 500 close: This is the closing value of the S&P 500 index,
- an average of the 500 stocks. It is not the futures,
- industrials, utilities, or financials. It is the close from the
- first Friday in the month.
-
- Prime Rate: This is the Prime interest rate charged by United
- States banks. It's hard to make a mistake on this familiar
- number. It is the latest available rate as of Friday.
-
- 90 Day Treasury Bill Rate: This is the latest week's rate on 13
- week T Bills. It is the Average Discount Rate, not the Coupon
- Equivalent Yield. This is a small but important difference. The
- yield will be higher than the discount rate.
-
- 30 Year Treasury Bond Rate: This is the latest week's rate on 30
- year Treasury bonds. It is reported under Adjustable Rate
- Mortgage Base Rates in Barron's.
-
- Consumer Price Index: This is reported in Pulse of Industry and
- Trade in Barron's. It is the familiar number used each month to
- gauge inflation. Due to reporting delays, it lags the others by
- two months so October's entries include the August CPI.
-
- Percent Unemployment: This is the Unemployment Rate in percent.
- It, too, lags the others by two months and is also found in the
- Pulse of Industry and Trade.
-
- S&P 500 Dividend %: This is the dividend yield of the S&P 500 in
- percent. It is reported in Barron's under Indexes' P/Es &
- Yields.
-
- S&P 500 P/E Ratio: This is the Price/Earning ratio of the S&P
- 500, reported near dividends.
-
-
- 3.2 Econometric Forecasts
-
- After entering the new data, choose this option 2 from the main
- menu. The predictions will be displayed on the screen and dumped
- to the printer if you chose the print option earlier. Forecasts
- include the S&P 500, bonds, T bills, and inflation, all 3 months,
- 6 months and 1 year in the future.
-
- The program calculates a recommended asset allocation . The 3-,
- 6-, and 12-month forecasts are combined to produce an estimated
- return for the near term. The calculated yields are displayed on
- an annualized basis for easy comparison. The dividend return is
- added to stocks' return from appreciation. The asset allocation
- routine looks at a portfolio containing a mix of three assets:
- Stocks, 30 year T bonds, and 90 day T bills.
-
- The estimated return and annual standard deviation of return for
- each asset is displayed. Two portfolios are calculated. The
- Conservative Portfolio is the one with the minimum standard
- deviation of any possible combination of these 3 assets. It will
- be mostly T Bills due to their risk-free nature and low standard
- deviation of return.
-
- The Aggressive Portfolio is willing to take more risk if more
- return is possible. It aims for a return halfway between the 2
- highest yielding assets. While many combinations will achieve
- this return, the Aggressive Portfolio displayed does so while
- accepting the minimum risk necessary to get the return.
-
- If you want to get more aggressive, add more of the highest
- yielding asset. There is an "efficient frontier" of portfolios
- which achieve a given return at the minimum risk. This can be
- thought of as a curved line starting at the Conservative
- Portfolio, passing through the Aggressive Portfolio and ending at
- 100% of the highest yield asset. You can get a good
- approximation of intermediate points with simple averaging of the
- above portfolios.
-
- Assets which have a negative estimated return (possible for
- stocks or bonds in bear markets) are immediately eliminated from
- consideration because cash in a mattress has a 0% return with
- zero risk. T bills will probably look better than cash.
-
-
- 3.3 Play "WHAT IF" Games
-
- This option allows you to enter data and get forecasts without
- storing the numbers. It is useful for checking effects of
- surprises such as market crashes, big up days, prime rate
- increases, or other news which causes concern. It also allows
- you to enter imaginary data and play with the numbers to get a
- feel for what is bullish or bearish. Use this routine to enter
- the most current data to get forecasts weekly if you like.
-
- All 8 numbers described in "Input monthly data" must be entered.
- You can input these numbers for as many months as you choose.
- For reference, the most recent data is displayed. To re-use a
- displayed number, just hit Enter when asked for its value.
-
-
- 3.4 Edit Files
-
- If a wrong number is entered and stored on disk, the problem can
- be fixed by editing the data file.
-
- 1. First, choose which of the 8 data files you want to
- edit. A list of entries is printed with a reference number
- to the left of each one.
-
- 2. To change an entry, enter its reference number, then
- change the value. To delete the last data value, enter
- zero for its value. Deletions are not allowed in the
- middle of the list. The last 12 entries are displayed, but
- older entries are available by entering their reference
- numbers.
-
-
- 3.5 Historical Forecasts
-
- Enter a year and month from the past and the program will use its
- database and models to give you its forecast and asset allocation
- for that time. This allows you to check the program's ability to
- spot past market movements. For example, look at the great bull
- markets starting August 1982 or December 1974. Test it against
- the August 1987 peak before the October crash.
-
- The historical forecasts are calculated from data available at
- that time, using the same models used to make the current
- forecasts and the same asset allocation routine. The linear
- regressions used to create the models used data from 1963 to
- 1989, so the models will perform well over that time. They
- cannot be guaranteed to continue to perform as well in the
- future.
-
-
- 3.6 Adjust File to New Baseline
-
- This routine is rarely used. Prices are subject to large changes
- over decades and occasionally the Commerce Department will make a
- major adjustment. Consumer prices use 1982 to 1984 for the base
- year (1982-1984=100). The base year was once 1967. This
- adjustment caused CPI values near 300 to plunge to 100 when
- prices actually hardly changed. The computer could interpret
- this as a crash in prices, so the historical data must be revised
- to the new index.
-
- To do this, enter a number from the old index and the equivalent
- value from the new index. The program will adjust all numbers.
- If one of the new numbers has already been entered, this routine
- will adjust it improperly. Use EDIT to verify that everything is
- OK after adjusting the file to the new baseline. Only CPI and
- Stock prices will need this adjustment since the others are
- expressed in percent.
-
-
- 3.7 Exit the Program
-
- Choose this when you are finished and want to return to DOS.
-
-
- 3.8 Help
-
- A short explanation of main menu items is available. Use the
- Print Screen (PrtSc) key if you want a hard copy of the paragraph
- displayed on the screen.
-
-
- 3.9 Printer Options
-
- Output may be directed to screen, printer, files, or other
- devices. Choose from the menu. Choice 1 directs output to
- screen only. Choice 2 works for most printers. To direct output
- to a file, choose 6, and enter the filename.
-
-
- 3.10 Print Registration Form
-
- This will send a copy of the registration form to your printer or
- other output device. It goes to LPT1: unless you use Printer
- Options to choose another device. When you register, you will
- receive a printed manual and a disk with current monthly data
- files. The registration fee is $39.99.
-
-
- 4. USING THE FORECASTS
-
- Many profitable strategies exist. One should be chosen that fits
- your available capital and tolerance for risk. The less capital
- you have, the more commissions will consume. Frequent trading
- can be very expensive. This program tries to find the large
- moves which continue for months or years. You probably should
- not make every change called for monthly in the asset allocation
- section.
-
- Backtesting the model over the period 1971 to 1990 shows a 16%
- per year average compound return from investing 100% of your
- money in the asset (S&P 500, T Bonds, or T Bills) forecasted to
- perform best under asset allocation. This method resulted in 2.1
- trades per year on average.
-
- Remember, these forecasts are not perfect. Like weather
- forecasts, they are subject to error. I try to give you an idea
- of the errors by reporting expected standard deviations under
- asset allocation. These are the standard deviations observed
- from 1963 to 1989. Standard deviation is a term from statistics
- describing a bell curve distribution. 68% of the time, the
- actual return will be within a range of plus or minus one
- standard deviation from the predicted return. 95% of the time,
- it will be within 2 standard deviations. Occasionally, there
- will be larger errors. The stock market has larger tails than a
- normal bell curve and there is reason to believe the standard
- deviation is not stable.
-
- No-load mutual funds that allow telephone switching are ideal for
- avoiding brokerage fees. Money market funds are similar to T
- bills but do not have a $10,000 minimums or commissions.
-
- One conservative strategy would be to switch between a stock
- mutual fund, a bond fund, and a money market fund in 50%
- increments only, trying to approximate the aggressive portfolio.
- For example, if the aggressive portfolio is 45% stock, 35% bonds,
- and 20% T Bills, you round it off to 50% stock and 50% bonds. If
- it later goes to 35% T bills, you go to 50 % money market and
- drop either stocks or bonds, whichever the aggressive portfolio
- is weighting less.
-
- The conservative portfolio is the least risky of any possible
- combination of the 3 assets. It is always mostly T bills, so
- it's not very interesting. Check its yield against the
- aggressive portfolio. If you're not getting at least 1% better
- expected yield in the aggressive portfolio, stick to the
- conservative portfolio and you will not be affected by market
- swings.
-
- I don't recommend following only the conservative portfolio
- because it is always heavily T bills. I print it out because it
- is the most conservative portfolio possible and it is useful for
- other asset allocation strategies such as averaging the
- conservative and aggressive portfolios. It is one endpoint of
- the efficient frontier, low return and very low risk. If you are
- really that risk-averse, just buy T bills and forget the markets.
- Of course, during bear markets, this works great and the
- aggressive portfolio should be the same as the conservative, 100%
- T bills.
-
- The aggressive portfolio suits me best. Its yield is halfway
- between the 2 best assets of the three (stocks, bonds, and
- bills). You get some diversity and some action from the stock
- and bond markets. If history is a useful guide, you will be on
- the right side of major moves. Although its name is aggressive,
- there are much more aggressive strategies.
-
- To get really aggressive, hold 100% of the asset predicted to do
- best at the beginning of the asset allocation printout. The
- program gives its expected returns on stocks, bonds, and T bills.
- Note that stock returns include dividends, and all returns
- average the annualized yields forecast for 3, 6, and 12 month
- periods. The aggressive portfolio is not as aggressive as this
- strategy and you can expect to get burned occasionally.
-
- If stocks are predicted to do quite well, you can buy them on
- margin and nearly double your return in a bull market. But you
- more than double your risk. A 50% market drop will wipe you out.
-
- The risk from stocks is doubled and you have added the risk due
- to fluctuations in the interest rate on your margin borrowing.
- Due to interest costs, your return does not double. This
- strategy and all the ones described previously lie on the
- efficient frontier.
-
- The efficient frontier is the imaginary line connecting
- portfolios with minimum risk for their expected return. The line
- starts at the Conservative portfolio, passes through the
- Aggressive portfolio, and continues to 100% of the highest yield
- asset. If the return on the highest yield asset is greater than
- the margin interest rate, the efficient frontier extends to a
- fully margined account containing the highest yield asset.
- Minimum risk for their expected return does not imply that they
- are all safe or that you should take such risks. A fully
- margined account would have been wiped out several times over the
- past century. Expected returns and actual returns will differ.
-
- If you want even more risk, use the options market. Wait until
- the S&P 500 is expected to advance 20% per year and buy calls.
- Or buy a call after a 5% dip in a bull market. It is easy to
- lose all your money if you are wrong, so treat this like gambling
- and bet only what you can afford to lose. It is speculation, not
- investing.
-
- For the totally crazy, there are the futures markets. 90% of the
- players lose money here, so I do not recommend it. You can lose
- more than your original investment and limit moves mean you can
- be stuck in a losing position. The advantage is that you get the
- gain or loss on a large block of stock represented by the S&P 500
- index for a reasonable commission. It is a game for experts
- only, armed with more knowledge than this program provides.
- Large sums of DISPOSABLE income and capital are required. T
- bills and T bonds also have futures markets.
-
- If you are playing the futures, this program should be useful to
- help you find the major trends. The trend is your friend. More
- money is made in the direction of the trend than on the reactions
- against it. You can be bailed out of losing trades when the
- trend re-asserts itself. Bull markets can be bought on 5% dips
- but not bear markets. If you have short term indicators, use
- them too but only play in the direction of the longer term move.
-
-
- 5. THE ECONOMETRIC MODELS
-
- The econometric models used in this program are based on
- multivariate linear regressions. The variables used were chosen
- from hundreds of others because they performed the best.
-
- In 1987, I used two advisors' models to forecast the stock
- market. Neither one predicted the crash that happened in
- October. Fortunately, I had sold most of my stock that summer
- because I was afraid of the rising interest rates and high P/E
- ratios. Still, I couldn't believe how many advisors and other
- models missed this major move. The crash of 1987 led to the
- development of this program in 1989.
-
- One problem with mathematical models is that they become
- obsolete. Stock Index futures make it possible to short stock
- and be neutral or long in the market. They also give
- institutions more reason to hold cash. Therefore short interest
- and mutual fund cash, 2 good indicators, have changed in meaning.
- The options market is larger now by far than it was 10 years ago.
- Odd lot traders now use options. Models constructed ten years
- ago often did not plan for such changes.
-
- To avoid these pitfalls, I chose the simplest, most elementary
- variables I could find. They also produce good correlations,
- which should not be surprising, since they are basic measures of
- value.
-
- Interest rates tell about the attractiveness of alternatives to
- the stock market. They also tell whether the economy is booming
- or busting. Interest Rates are a measure of the supply and
- demand of money. When rates are high and rising, stocks will be
- falling. If I could have only one indicator, it would be short
- term interest rates.
-
- Consider market history 1948 to 1987. When T bill rates fell
- December to December, the return on the S&P 500 averaged 23.4% in
- the following year. When T bill rates rose, returns averaged
- 6.7%. T bill rates were rising going into the crash of 1987.
-
- The yield curve compares short term rates to longer term rates.
- When short rates are higher, the yield curve is said to be
- inverted. It is not normal and usually precedes recessions.
- Stocks usually fall during these times. In his book Stock Market
- Logic, Norman Fosback reports the impact of the yield curve.
- Normal yield curves were followed by an average 11.5% per year
- gain on the S&P 500 in the years 1941 to 1975. Inverted yield
- curves were followed by an average 0.7% loss.
-
- Consumer prices are a measure of inflation. When inflation is
- low, interest rates stay low, and the stock market rises. High
- or rising inflation can be curbed by raising interest rates to
- choke off demand. This also strangles the stock market. High
- inflation offers people an alternative to the stock market. It
- is better to spend the money on goods before prices rise, or
- invest in real estate.
-
- Unemployment also exerts political pressure on the Fed. They are
- hesitant to raise interest rates during high unemployment. The
- economy needs stimulation, not restraint. A good time to buy
- stocks is when unemployment is rising in a recession.
-
- Dividend yields are an excellent long term forecaster. They set
- record lows before the October 1987 crash. They were low in 1929
- and also in 1973 before bear markets. Low dividends called the
- sharp 1962 drop. High dividends predicted the 1982 bull market,
- the 1975 bull market, and the long advance of the 1950s.
-
- In the years 1948 to 1987, dividend yields above 4% on the S&P
- 500 led to an average 20.0% return on the S&P 500 the following
- year. Dividend yields below 4% were followed by an average 5.1%
- return.
-
- Price/Earning ratios are another good measure of value. It is
- always safe to buy the S&P 500 at low P/E's. The long term
- average is about 14, so a P/E of 8 for the S&P 500 is cheap.
- Recessions can depress earnings, so it is safe to buy at higher
- P/E's then because good times will return and carry earnings
- higher.
-
- I believe these variables are of such a basic nature that change
- in our markets or economy won't change their effects much. But
- if you have reason to suspect these variables, don't follow this
- model blindly.
-
- 5.1 Checking the forecasts
-
- Here is a simple way to check the model's forecasts for the S&P
- 500. We can combine T bill rates and dividend yields into a
- model that you can do in your head. We have seen the high
- returns on the S&P 500 with falling T bill rates, and with
- dividend yields above 4%. Combining these 2 variables is even
- better. With both variables bullish, the average return on the
- S&P 500 is 30.8% per year. With only one of them bullish, the
- return is 9.7% per year. With both in bearish territory (rising
- T bill rates on a 12 month basis, and dividend yield on the S&P
- 500 less than 4%) the average return on the S&P 500 is 3.7% per
- year.
-
- Of course the models in the program are much more complex, and
- should be more accurate. This example demonstrates the power of
- a two-variable model and used data from 1948 to 1987.
-
- The business cycle provides an independent check on the
- forecasts. For details, see Bowker's book Strategic Market
- Timing. Events may occur somewhat out of order, but you should
- be able to get an idea of where the economy is heading. The
- sequence of events is:
-
- 1) Stock Market bottom
- 2) Leading indicator bottom
- 3) Coincident indicator bottom
- 4) Unemployment peak
- 5) Official announcement of Expansion
- 6) Lagging indicator bottom
- 7) Inflation bottom
- 8) T bill interest rate bottom
- 9) T bond interest rate bottom
- 10) Stock Market peak
- 11) Leading indicator peak
- 12) Unemployment bottom
- 13) Coincident indicator peak
- 14) Official announcement of Recession
- 15) Lagging indicator peak
- 16) Inflation peak
- 17) T bill interest rate peak
- 18) T bond interest rate peak
- 19) Back to Stock Market bottom
-
- If you want graphs of these indicators, subscribe to the Survey
- of Current Business by calling 202-783-3238, or write
- Superintendent of Documents, U.S. Government Printing Office,
- Washington, DC 20402. The cost is $29.00 per year.
-
-
- 5.2 Details on the Regressions
-
- I used stagewise multivariate linear regression on 25 years of
- data spanning 1963 to 1989. In stagewise regression, the best
- variable is found and its effect is subtracted out. Then all
- variables are examined again for correlations to the residuals.
- To enter the model, a variable must have 99% confidence that its
- correlation is not due to random variations. An F test was used
- for this. The process continues until no more variables can pass
- the F test.
-
- Many predictor variables can be constructed from the database.
- The Prime rate can be compared to moving averages from 3 months
- to 4 years in length. Dividend yields can be compared to T bill
- yields. The yield curve can be computed as T bill/T bond rates.
- I looked at 165 such predictor variables for each model to pick
- only the most effective variables.
-
- Correlation coefficients are a measure of a model's fit to the
- data. They range from -1.0 (perfect negative correlation) to 0.0
- (no correlation) to 1.0 (perfect correlation). Here is a list of
- the model's correlation coefficients:
-
- S&P 500 (3 months ahead).....................R = .53
- S&P 500 (6 months ahead).....................R = .64
- S&P 500 (1 year ahead).......................R = .80
- T Bonds (3 months ahead).....................R = .46
- T Bonds (6 months ahead).....................R = .58
- T Bonds (1 year ahead).......................R = .74
- T Bills (3 months ahead).....................R = .56
- T Bills (6 months ahead).....................R = .66
- T Bills (1 year ahead).......................R = .68
- CPI (3 months ahead).....................R = .83
- CPI (6 months ahead).....................R = .87
- CPI (1 year ahead).......................R = .90
-
- R values are not the only measure of a model's effectiveness.
- There are many ways to get a high R value. One way is to include
- a lot of variables which have a low confidence. My 99% standard
- is more rigorous than many others. Another way is to regress to
- something easy. I am regressing to the changes in my predicted
- variables, not to their levels. Over a 25 year period, the
- previous day's level of S&P 500 correlates with R > .99 to the
- next day's level, but tells you nothing about which way the
- market will go. The money is made on the changes, not on the
- day's closing value.
-
-
- 6. GETTING HELP
-
- Your satisfaction is of utmost importance to us. If you need
- help, first consult this manual or the help menu. If that does
- not fix your problem, please write to:
-
- DC ECONOMETRICS
- 2920 Mount Royal Court
- Fort Collins, CO 80526
-
- We want to hear your comments, suggestions, and criticism.
-
-
- 6.1 Error Messages
-
- If you ever see an error number, here is a list of the most common
- ones.
-
- Error# Meaning
- ------ -------
- 24 Device time out. COM device?
- 25 Device fault. Printer interface?
- 27 Out of paper.
- 53 File not found. Change directory to the one containing
- econ. Type "dir" and check for econ.exe and the 9 data
- files. If your prompt is for the C: disk and econ is
- on B:, type "b:".
-
-
- 7. RECOMMENDED READING
-
- The Encyclopedia of Technical Market Indicators
- Robert W. Colby and Thomas A. Meyers
- Dow Jones-Irwin, 1988
-
- A comprehensive collection of graphs and computer
- research on over 110 indicators.
-
- Stock Market Logic
- Norman G. Fosback
- The Institute for Econometric Research, 1976, 1984
-
- This book is a thorough discussion of virtually every
- stock market indicator in use. Norman Fosback's
- scholarly approach to stock market forecasting is
- without equal among advisory services.
-
- Winning on Wall Street
- Martin Zweig
- Warner Books, Inc., 1986
-
- Marty Zweig's emphasis on interest rates and tape
- action first influenced me in 1982. He talks about the
- market in scientific terms I can relate to as an
- engineer. His record proves he is right.
-
- Tight Money Timing
- Wilfred R. George
- Praeger Publishers, 1982
-
- This book shows the effect of interest rates on the
- stock market from 1914 to 1981.
-
- Asset Allocation
- Robert D. Arnott and Frank J. Fabozzi
- Probus Publishing Co., 1988
-
- Everything you ever wanted to know about asset
- allocation and then some. It is a complete discussion
- of theory and application. Many contributing authors
- present their views.
-
- A Consensus Approach to the Determination of Not-So-Good Years to
- Own Common Stock
- Edward Renshaw
- Financial Analysts Journal/January-February 1989
-
- How to forecast the S&P 500 using T bill rates and
- dividend yields. This simple method is similar to the
- simple model in the manual, and will usually agree with
- the complex models in the software.
-
- Strategic Market Timing
- Robert M. Bowker
- New York Institute of Finance, 1989
-
- Use predictable turning points in the business cycle to
- forecast the direction of interest rates, stock prices,
- and other economic indicators. This method provides an
- independent check on econ's forecasts.
-
- How to Forecast Interest Rates
- Martin Pring
-
- Interest rates are a lagging indicator. They go up
- after the economy goes up.
-
-
- 8. PLACING AN ORDER
-
- Order by mail. Payment may be made by credit card,
- check, or money order. Use the order form below.
- Shipping is free. We prefer payment by check.
-
- DESCRIPTION QUANTITY PRICE
-
- 5.25" diskette and manual ________ $39.99
-
- 3.5" diskette and manual ________ $39.99
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- TOTAL ENCLOSED ________
-
-
- Please charge my ____ VISA ____ MASTERCARD
-
- CREDIT CARD NUMBER ____________________________________________
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-
- Ship to:
-
- Name:__________________________________________________________
-
- Address:_______________________________________________________
-
- City:___________________________State__________Zip_____________
-
- Country:_______________________________________________________
-
- Please send your order to:
-
- DC ECONOMETRICS
- 2920 Mount Royal Court
- Fort Collins, CO 80526
-
- To register your copy of econ, choose 10 from the main menu to
- print a registration form. For your $39.99 registration fee,
- you will receive a disk with all current monthly data files and
- a printed manual. Registered users may order a new disk with
- current data files any time for $9.00. This is handy if you
- forget to enter data for a while but want to start using the
- program again, or if you destroy your disk. Please specify
- 5.25" or 3.5" disk.
-
- To view this manual on screen, enter "type econ.txt | more" from
- MS-DOS. This will let you see one screen at a time. Press the
- space bar to see the next one.
-
- To send a copy to your printer, ready the printer, and type
- "copy econ.txt > prn". Don't type the quotes, just the stuff
- inside them.
-
-