%grlog
----------------------------------------------------------------------
  Creates a graph of the logistic regression curve.

Description

  The %grlog macro will show a graph of a logistic regression
  curve for a given intercept and slope and then save it as a gif 
  file.  The gif file can be used as a graph in a web page.  The 
  location and options for the gif file are specified in a separate 
  macro called gifinit.  The default values are those shown in the 
  syntax section.

Syntax

  %grlog(a=0 ,b=0.5 ,reset=yes ,gif=no , fname=c:\grlog.gif );

    a      - intercept 
    b      - slope   
    reset  - determines if the goptions are reset after running the 
             macro 
    gif    - specifies whether the graph will be saved as a .gif file
    fname  - filename for graph saved as a .gif file


Examples

  %grlog;

  %grlog(a=.3,b=1.2);

  %grlog(a=.4, b=5, gif=yes, fname=c:\temp\grlog.gif);

Author

  Michael Mitchell
  mnm@ucla.edu
  UCLA Academic Technology Services
  Statistical Consulting Group

Also See

  See a complete example in
    http://www.ats.ucla.edu/stat/sas/teach/grlog/grlog.htm
    
  Also see macro at
    http://www.ats.ucla.edu/stat/sas/teach/grlog/grlog.sas.txt