ProfitPress Mega CDROM2 Shareware Freeware (MSDOS)(1992)(Eng)

home *** CD-ROM | disk | FTP | other *** search

/ ProfitPress Mega CDROM2 …eeware (MSDOS)(1992)(Eng) / ProfitPress-MegaCDROM2.B6I / MISC / MATH / FIT2_117.ZIP / FIT2.DOC < prev next >

Wrap

Text File | 1991-05-21 | 13.7 KB | 394 lines

FIT2.EXE, curve fitting and data modeling ***************************************** ____________________ │ │ │ version 1.17 │ │ │ │ May / 1991 │ │____________________│ What is FIT2 ? ************** FIT2 is a tool that allows you to find closed-form solution to both linear and non-linear modelling problems. What are the main resources of FIT2 ? ************************************* - FIT2 produces screen graphics that are automatic scaled and displayed in CGA mode (or EGA, VGA, depending the graphic card you desire). A HERCULES GRAPHICS ADAPTER with CGA emulator will also work fine. - FIT2 provides very powerful data analysis tools that include not only linear regression analysisbut non-linear and specially polynomial regression. - FIT2 allows you to extrapolate values for any curve, with a graphical vision. - with FIT2 you can make data transformation like adding something to Y series, or generating a random Y series, etc. - FIT2 uses a ASCII open format for data files and it provides a simple way to export and import data from/to popular spreadsheet and others packages interfaced with FIT2. Why FIT2 ? ********** I wrote FIT2 because I use data analysis daily and needed a little more than the spreadsheets had to offer. I do have several other curve fitting programs at my disposal, and no doubt they have some great features, but I have yet to find one with this friendly interface. I was tempted to write a full curve fitting in the beginning, but I have decided against it since comercial packages actually does quite nicely under most circumstances: they come with expensive packages, they have high level routines, and they will do most everything you need a curve fitting program will do. Because of that, I decided to simply write something simple to solve the common problems that I have. Are there any outstanding bugs that you know of? ************************************************ FIT2 has been tested on an IBM PC, PC/XT, PC/AT, PC386 and laptops as TOSHIBA T1000, T3100 computers. No troubles were detected. You can use up to 5000 data points. Sometimes overflow occurs because in this version I have used single precision values. Lets explain each of the features of FIT2: ****************************************** 1.) data entry - keyboard This is the mechanism used to introduce data using the keyboard, without edition. After FIT2 is loaded the default is the keyboard data entry option. You can move to other options pressing up or down the arrow key. 2.) data entry - file This feature allows you to select a file (extension .DAT) to load the data to the memory and work. Pressing the up or down arrow key, point to the name of the file desired to load and press RETURN. The seventy first characters of the 10 top lines are displayed with the reference position of each digit of the file data. Choose the correct distribution of digits and enter with the loading data. example: seventy characters of the 10 top lines: xxxxxx (below) Supose that you want to do the variable C as X and the variable A as Y. Than choose the following: A B C D 1 5 81 41 2 3 82 42 3 4 85 43 4 4 82 42 5 8 83 41 6 11 87 42 7 52 88 43 8 12 89 40 9.5 7 111 19 12 11 101 58 1........01........01.......01........01..................... │ │ │ │ │ │ │ │final position │ │ │ │of X variable │ │ │ │ │ │ │ │ │initial position │ │ │of X variable │ │ │ │final position │ │of Y variable │ │ │initial position │of Y variable Enter the values for each position or ENTER for defaults. If there are "dummy lines" or lines that the program have to jump (skip) when reading data. For example, imagine that one line is usefull and the other is unusefull, till the end of the file. So inform to the dummy lines question the value 1, for read one line and skip the following, and so on. With dummy lines=2 3 read this line 5 do not read 6 do not read 9 read this line 12 do not read 34 do not read 12 read this line ................ ................ For exit without loading file enter 0 (zero) for each question. 3.) Save current data This feature allows you to save the current data in disk files with .DAT extension name. Only after saved the current data, the TITLE will be displayed on the top of each graphic screen. The format used for saving data on disk is with five integers and four decimals, separeted by a dot (#####.####). 4.) Edit current data This is how you change the values of the current memory. The options are showed at the bottom line and it is possible to: - delete a value pressing DEL and giving the order of the value to be deleted. - modify a value pressing F1 and giving the order and contents of X and Y variables. - insert a new value pressing INS and giving the position as well the contents of X and Y values. - move to bottom (END) or top (HOME) or each page up (PGUP) or each page down (PGDN). 5.) Print current data This option allows you to output the current value on the printer. 6.) Linear regression This option shows graphically the points introduced and the best line fitted to these points, with the equation and the coefficient of determination. 7.) Exponential regression This option shows graphically the points introduced and the best exponential curve fitted to these points, with the equation and the coefficient of determination. 8.) Geometric regression This option shows graphically the points introduced and the best geometric curve fitted to these points, with the equation and the coefficient of determination. 9.) Logarithmic regression This option shows graphically the points introduced and the best logarithmic curve fitted to these points, with the equation and the coefficient of determination. 10.) Polynomial regression This option shows graphically the points introduced and the best polynomial curve fitted to these points, with the equation and the coefficient of determination, initialy for the second degree equation. The program allows you to try other degrees up to 6 and extrapolate values too. OBS: In each type of regression allows you to extrapolate values using the E option. A graphic symbol appears on the curve and it is possible to navigate whith the Left and Right arrow keys, as well increase and decrease the step of navigation with + and - keys. 11.) XY operations This option allows you to manipulate data for normalizing, adding, etc ... , giving chances to prepare the data for fitting. The options of XY operations are: -swap X with Y change the values of X with Y -new Y = log(Y) calculate Y as log(Y) -new Y = power of Y p calculate Y as Y , while p is the power -new Y = exp(Y) calculate Y as exp(Y) -new Y = 1/Y calculate Y as the inverse of Y (or 1/Y) -add something to Y add a constant value to Y -multiply Y by something multiply Y by a constant value -X ordination, swaping Y put the X series in crescent order, changing the position of Y also -X ordination, Y independent put the X series in crescent order, without moving Y -Y Random generation, same X generating a new Y series with randomic numbers, using the same old X -new Random file generation generate a new file with Y series as a random series and X series with the crescent order of series -replace Y values substitute all the Y values that satisfy one of the three following conditions: G for greater than a determined value E for equal than a determined value S for smaller than a determined value replace the checked values by a new value in all Y series example: substitute all values greater than .3 by .1 entries: g .3 .1 -extract Y values extract from memory all the Y values that satisfy one of the three following conditions: G for greater than a determined value E for equal than a determined value S for smaller than a determined value -return to main menu go back to main menu 12.) Line graphics This option shows graphically the points introduced connected by lines, in the current order. 13.) Program references Some information about the program and rules for shareware conditions. Files that come with FIT2 ************************* FIT2.ZIP - ZIP file containing all files The files: FIT2.EXE - executable file with the program FIT2.DOC - document file and manual EXAMPLE1.DAT - example number 1 EXAMPLE2.DAT - example number 2 Learning with an example: ************************* Type FIT2 and press RETURN Press the down arroy key till the DATA ENTRY - FILE and press RETURN Press RETURN and the file EXAMPLE1.DAT will be loaded Press RETURN again because the file is a default type Wait for the loading Choose the LINE GRAPHIC option and press RETURN Choose the LINEAR REGRESSION option and press RETURN Choose the POLYNOMIAL REGRESSION and press RETURN Press the N key in POLYNOMIAL REGRESSION and choose a degree 4 etc........................................................... You can copy FIT2 ***************** Welcome to FIT2. This is used supported software, or SHAREWARE. You are encourage to make copies for your friends, as well as trying out the program for yourself. If you like it and continue to use it regularly, please register your use by sending US$ 25.00 to: ARMANDO OSCAR CAVANHA FILHO, account number 113000609:01800285338, Texas Commerce Bank - 10411 WESTHEIMER - BOX 42370 Lakeside - HOUSTON, TX, 77242-2370, USA For brazilian users, send the cruzeiros equivalent to US$ 25.00 to: BRADESCO - AGENCIA 2606-9 - CONTA 1279-3 RIO DE JANEIRO RJ BRAZIL Send the receipt to: ARMANDO OSCAR CAVANHA FILHO AV. CANAL DE MARAPENDI 2500 BL 3 APT 2305 RIO DE JANEIRO - BRAZIL - 22631 phone (021)3255179 ...and receive new versions at substantial reduced price. Thank you. (AOCF) Please make copies of the module FIT2.ZIP only.