Dec 262017

EGA regression analysis designed for two variable correlation analysis. Looks excellent for students, etc. | |||
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File Name | File Size | Zip Size | Zip Type |

EGACORR.EXE | 75447 | 48632 | deflated |

EGACORR.TXT | 5081 | 1967 | deflated |

SAMPLE1.DAT | 171 | 111 | deflated |

SAMPLE2.DAT | 400 | 193 | deflated |

SAMPLE3.DAT | 161 | 118 | deflated |

# Download File EGACORR2.ZIP Here

## Contents of the EGACORR.TXT file

E G A R E G R E S S I O N A N A L Y S I S

By

Paul A. Wangerin

1821 W. Daisy Lane

Glendale, Wisconsin 53209

(414) 351-6254

EGA Regression Analysis is an easy to use program designed for

simple 2-variable correlation analysis. Its main purpose is to take

advantage of the properties of EGA graphics in conducting such an

analysis. The user of this program is free to inspect and test it at

no charge. If you should find this program of some utility a donation

of $5.00 sent to the author would be greatly appreciated. You will

then be placed on a mailing list and informed of any future revisions.

PLEASE feel free to send any comments and suggestions-- a response

will be given.

I hope you enjoy this program!

USING THE PROGRAM: (Entering the data and setting the parameters)

-----------------

NUMBER OF DATA POINTS--Whether data is entered from the keyboard

or from a file you must input the number of X,Y points to be used.

SIZE OF SCATTER POINTS--A number between 1 (smallest) to 3

(largest) is entered here. Generally the larger the data set the

smaller you would want your plotted points to be and vice versa.

Experiment with this option to your own satisfaction.

FILE CREATION AND STRUCTURE--Data files are created using a pure

ASCII editor such as DOS EDLIN and have the following structure:

"URBAN GROWTH" (Name of X-variable in quotes)

"##.##" (Print using FORMAT for values on X-axis of graph)

"POP. GROWTH RATE" (Name of Y-variable in quotes)

"###.#" (Print using FORMAT for values on Y-axis of graph)

2.33,5

4.22,10

3.16,7.5 X,Y pairs (Separated by a Comma)

-1.2,-3

6.4,12.22

etc.

Note: Sample files have been included with the program called

SAMPLE1.DAT (N=14), SAMPLE2.DAT (N=39) and SAMPLE3.DAT (N=11).

-Page 2-

You may also input your values from the keyboard--simply select

this option when prompted. Note that the maximum length of the format

string is 5 characters. Also, you do not need to use quotes for

variable names and formats when entering them from the keyboard.

DEFAULT values may be selected by hitting

points are then entered one at a time when prompted.

DATA TRANSFORMATION:

Data may be transformed to account for skewness in the marginal

distributions and in effect to reduce non-linear equations to their

linear form. Three basic transformations for the x-variable are

utilized: Log base 10, reciprocal (1/x), and x-squared. The effect

of the first two transformations is to skew the x-distribution in

the negative direction while the x-squared transformation will

skew the distribution in the positive direction.

NOTES ON THE OUTPUT:

1. The red-line on the graph represents the LEAST-SQUARES regression

line of Y predicted from X.

2. The vertical red-line represents the size of the Standard Error of

Y from Y predicted:

2

( ( Y' - Y ) / N )

3. Y is always the dependent variable, X the independent or predictor

variable.

4. Slope and intercept represent the values of b and a in the

equation of the form: Y' = a + bX

5. Significance is one minus the probability of ZERO correlation

in the population.

PRINTING THE SCREEN:

In order to print the screen you need to have installed an EGA

SCREEN PRINT utility. DOS GRAPHICS command will NOT print screens of

this resolution. The author of this program has found Charles

Petzold's EGAGRAF.COM (from PC-MAGAZINE "DOS Power House Tools") very

effective in this regard.

This program was written and compiled using MICROSOFT QUICK BASIC 4.0.

* * *

December 26, 2017
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