grols.hlp.htm

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help for grols
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Graphing OLS Regression
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To invoke, type

. grols

This program shows the regression line between X and Y
using Ordinary Least Squares (OLS) Regression.  

When you run grols a simple regression line 
is displayed and with a single point which is the 
predicted value for Y when X is 0.  You can change
the intercept (a) and slope (b) of the line, and you
can increase/decrease X to show how the predicted 
value of Y changes as X changes, as described below.

The dialog box allows you to adjust
  a-.1 and a+.1 : adding and subtracting .1 from the intercept.
  b-.1 and b+.1 : adding and subtracting .1 from the slope.
  X-1  and X+1 (if you choose "show point at prected value of X")
    This allows you to add and subtract 1 from X, and see
    how it impacts the predicted value of Y.

  The "Done" button quits the program.
  The "Reset" button resets a, b and X to their default
    values, i.e. a=0, b=1, and X=0.
  The "Help" button brings up this help screen.

If you have comments or suggestions, please email 
Michael Mitchell at mnmatucla.edu .

Author
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Michael N. Mitchell
Statistical Computing and Consulting
UCLA, Academic Technology Services
mnmatucla.edu