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- Statistics (LozStats) Manual Version 2.41
-
-
-
-
-
- DISTRIBUTION:
-
-
-
- Statistics version 2.41 is public domain emailware. Anyone can use
- it and you are free to distribute it - as long as you're not making
- pots of money out of it! If you use it you should send me a woman
- ;) or an email.
-
-
-
-
-
- INTRODUCTION:
-
-
-
- I can only remember seeing one other statistics package on the
- Amiga and that was in the early days (around 1987) and it cost
- several hundred pounds. Although a number of spreadsheets are
- available, none compare with Microsoft Excel or Lotus 1-2-3 for
- (ugh!) Windows and spreadsheets are not that easy to use for
- statistical analysis.
-
-
-
- This version allows 50 variables and 500 cases. Unfortunately it's
- still a bit rough around the edges. Considerable development time
- was wasted because of a bug in HiSoft Basic 2.00 that HiSoft were
- unwilling to fix. As a result I had to change to Blitz Basic 2.10
- which is faster, but has required a massive conversion effort.
-
-
-
- I do not intend to explain the statistical theory of the tests - if
- you do not understand what the program is for - this package is not
- for you. A good easy to understand statistics book to accompany the
- program would be: "Business Statistics, A Decision Making Approach"
- (1985) D.F. Groebner & P.W. Shannon, published by Merrill.
-
-
-
- I'm sorry but I accept no responsibility for any difficulties
- (crashes, inaccurate results etc.) you encounter, as a result of
- using this software. If you have any problems drop me a line and
- I'll see what I can do.
-
-
-
- Contact .............. Dr. Lawrence Harrell
-
- BNR Consulting Ltd.,
-
- bnr.cons@virgin.net
-
-
-
-
-
- INSTALLATION AND REQUIREMENTS:
-
-
-
- The program can be installed on hard disk or copied to your own
- floppy disks. Please note that the program requires the Topaz 11
- font to be present in the Workbench "Fonts" directory. Topaz 11
- is provided on all Amiga systems. Workbench 2.00 or above is
- required. I have no idea of the memory requirements, as I have
- 34mb, but I think that it will run on a 2mb machine.
-
-
-
-
-
- BASIC OPERATION
-
-
-
- Upon loading the program you are presented with the data entry
- screen. If you have a compatible statistics file that you wish to
- work on, select "load" from the pull down menu and load the file.
- If you are creating a new file, select "add variable" from the pull
- down menus. Continue until all variables have been entered. Next
- select "add cases" and type in the number of cases in your data
- set. If you are not sure how many cases there are - type in an
- estimate (it is easy to add or delete cases later). Your data
- entry template is now complete.
-
-
-
- Until the data has been entered all cells are filled with the
- missing value - cells containing missing values are ignored in the
- analysis. You can select the number that represents the missing
- value from the pull down menus. The default value is 99.
-
-
-
- To enter/edit data move the cursor to the cell you wish to change
- using the arrow keys. Now type the number and move to another
- cell. The number is automatically entered when an arrow key is
- pressed (you do not need to press enter). NOTE that the number you
- have typed will not appear on the screen until an arrow key is
- pressed.
-
-
-
- Now that the data is in, it can be analysed by selecting "analysis"
- from the menus. A number of options are available and most basic
- statistics (average, standard deviation etc.) are produced using
- the "basic stats" option. The best approach is to play around with
- the data set provided (Test.sts) and see what happens.
-
-
-
-
-
- IMPORT/EXPORT OF DATA:
-
-
-
- The easiest way to import/export data is to use a spreadshseet that
- supports space separated values (called CSV space in TurboCalc).
- Most versions of TurboCalc do this (3.5 and above definately -
- earlier ones possibly).
-
-
-
- Data can be imported from spreadsheets in the following way. In
- the first row of the spreadsheet put:
-
-
-
- CELL 1 CELL 2 CELL 3
-
- Number of cases Number of variables Missing value
-
-
-
- In the next row of the spreadsheet put:
-
-
-
- CELL 1 CELL 2 CELL ..etc
-
- Variable name 1 Variable name 2 Variable name...
-
-
-
- The variable name must be a maximum of 8 characters. The data
- follows below the variable names. Statistics should be able to
- import such a file without problems, as long as you correctly
- specify the number of variables, cases and the missing value in the
- first row of the spreadsheet.
-
-
-
- Using the import function on TurboCalc you should be able to load
- in a Statistics file - again using the CSV space separated option.
-
-
-
-
-
- LIMITATIONS - READ CAREFULLY!!
-
-
-
- There are a number of waaknesses in this software that should be
- borne in mind before anyone starts using it for serious analysis.
-
-
-
- ~ The program will not accept negative numbers.
-
- ~ The paired statistics calculations work on the basis that both
-
- variables have the same number of cases - this limits the
-
- useulness of the F and independant T tests (hope to sort it our
-
- in the next revision).
-
- ~ The same missing value has to be used for every variable.
-
- ~ If you enter very large numbers i.e. above 9999,999.00 screen
-
- formatting can become a bit dodgy. Entering huge values (like
-
- population figures) is best done by inputting, e.g. 12.1 for 12.1
-
- million etc.. Although you can enter values with more than two
-
- decimal places and they will be used in the calculations - they
-
- will not be displayed in the editor.
-
- ~ The latest non-parametric routines have not been extensively
-
- tested.
-
-
-
- The program opens on a hi-res interlace screen. If you have a 1084
- monitor or a SCART T.V. you may find that setting your workbench
- screen to NTSC (Workbench 2.04+ only) makes the screen more
- readable as well as saving memory and reducing flicker. If you do
- this is combination with the MagicTV program you will very nearly
- have a flicker free interlaced display on a TV!
-
-
-
- To set up for NTSC move the NTSC monitor into your devs/monitor
- drawer. Add the line "sys:devs/monitors/NTSC" to your startup-
- sequence immediately before the line "LoadWB". Now double click on
- the NTSC picture in devs/monitors and go to prefs/screenmode.
- Select NTSC Hires laced and then save. Now reboot. You may have
- to adjust the workbench palette a bit to reduce flicker. As you
- would expect I accept no responsibility if it blows up your monitor
- (not all PAL TV's can handle NTSC - though Sony and Philips ones
- seem to be OK), but it works on mine!
-
-
-
- Very minimal graphics are included and at present results cannot be
- output to a printer. One very cludgy way around this is to use a
- screen dump program. You will make best use of the program if you
- have a compatible spreadsheet. Any graphs, barcharts etc can be
- produced using a spreadsheet. I see no point in spending hours
- duplicating the graphing facilities of spreadsheets.
-
-
-
- The software is reasonably crashproof (I have used it a lot with
- large data sets over the last ten years and during my Ph.D.). The
- production of the later versions has resulted in some substantial
- changes to code and some new bugs must have been created.
- Furthermore if you try silly things - you may be able to crash the
- program, so save your data regularly. If you register by email I
- can let you know about upgrades.
-
-
-
- If you want to moan: remember what you paid for this program and
- how much statistical software can cost!
-
-
-
-
-
- FUTURE:
-
-
-
- I hope to iron out any further bugs and add: better help and data
- labels. Development has been pretty slow lately as a result of the
- Amiga's troubles. I would prefer to develop in a more portable
- Basic dialect, so that I can compile it on other OSs - in case the
- Amiga goes totally belly up.
-
-
-
-
-
- THE AUTHOR - BNR CONSULTING Ltd:
-
-
-
- I work as a freelance market analyst and economist and have
- particular experience in the transport/travel/tourism field.
- Previous experience includes:
-
-
-
- ~ demand forecasting for Sydney airport rail link.
-
- ~ demand forecasting for Sydney LRT system.
-
- ~ customer satisfaction surveys for transport
-
- undertakings.
-
- ~ assiting in railway pricing research for UIC/CER
-
- ~ working on fourth framework EU projects.
-
-
-
- Depending on other commitments, I and my associates are available
- as contractors and to conduct research for clients in any part of
- the world - at very competitive rates. Particular specialties
- include:
-
-
-
- ~ Demand forecasting (prediction of consumer behaviour).
-
- ~ Designing, analysing and conducting market surveys.
-
- ~ Report writing and presentation.
-
- ~ Stated Preference (Conjoint analysis).
-
- ~ Public transport planning
-
- ~ Computer demand models (basic programming and
-
- spreadsheets).
-
-
-
- For further information contact me via email.
-
-
-
-
-
- HISTORY:
-
-
-
- VERSION 1.10 ENHANCEMENTS (1988):
-
-
-
- The program has been made more multi-tasking friendly and is less
- processor hungry when waiting for user input.
-
-
-
- There is a new title screen.
-
-
-
- Control of the display while viewing data has been improved.
-
-
-
- The amount of data that the module can handle has been increased
- from 300 to 500 values.
-
-
-
- A number of bugs have been removed from the regression module that
- could give rise to, 'division by zero errors'.
-
-
-
- The correlation matrix display has been enhanced.
-
-
-
- A disk swapping bug causing, 'unknown volume' error has been cured.
-
-
-
- Some preparations have been made to merge the two modules at a
- later date.
-
-
-
- The Regression predictions section now works correctly and is more
- closely linked to the generation of the regression equations.
-
-
-
- Finally it is easier to increase the number of cases in the data.
-
-
-
- VERSION 2.00 ENHANCEMENTS (1995):
-
-
-
- Program sets up its own hi-res interlace screen with flicker
- minimising palette and selects Topaz 11 font for a consistent
- appearance on all systems.
-
-
-
- Better presentation and more user friendly.
-
-
-
- Many algorithms speeded up.
-
-
-
- Improved error trapping and a number of bugs removed.
-
-
-
- Vastly improved data entry/editing.
-
-
-
- Pull-down menus.
-
-
-
- Ability to conduct analysis on single variables added.
-
-
-
- Independent t test, coefficient of variation, minimum, range and
- pooled standard deviation added.
-
-
-
- Speech removed, beeps added.
-
-
-
- Improved export of data.
-
-
-
- VERSION 2.10 ENHANCEMENTS (1991):
-
-
-
- Various bug fixes.
-
-
-
- ARP file requester added.
-
-
-
- Data recode added.
-
-
-
- Text input area cleared after error.
-
-
-
- Data transform debugged and moved to data entry module.
-
-
-
- VERSION 2.20 ENHANCEMENTS (1996):
-
-
-
- ASL file requestor added
-
-
-
- Fixed bug in add variables module.
-
-
-
- Added Cross-tabs.
-
-
-
- Improved User-interface.
-
-
-
- VERSION 2.30 ENHANCEMENTS (1997):
-
-
-
- Rewritten for Blitz Basic 2.10, significantly faster.
-
-
-
- VERSION 2.31 ENHANCEMENTS (Jan 1998):
-
-
-
- Improved import/export of data.
-
- Slight speed increase.
-
-
-
-
-
- VERSION 2.40 ENHANCEMENTS (April 1998)
-
-
-
- Program now checks for PAL/NTSC and opens window accordingly.
-
-
-
- Made it easier to exit program!
-
-
-
- Added in Wilcoxon, Mann-Whitney and Kruskall Wallis tests.
-
-
-
- More multitasking friendly.
-
-
-
- VERSION 2.41 ENHANCEMENTS (March 1999)
-
-
-
- Fixed a bug in median calculations.
-
-