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help for catgraph                                                   Nick Winter
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Plotting Means of a Variable, by Category

     catgraph yvar xvar [if exp] [in range] , by(varname)
               stat(collapse_statistic) graph_options


Description

catgraph plots a summary statistic (means by default) of yvar against xvar,
     separately for categories of varname.


Options

by(varname) specifies the variable that specifies the categories for
     plotting. catgraph plots one series for each value of varname. by() may
     be numeric or string. If by is not specified, one category encompassing
     all the data is plotted.

stat() specifies the statistic to be plotted. The default is to plot the mean
     of yvar for each value of xvar. Any valid statistic for the collapse
     command may be specified.


Examples

     . catgraph mpg rep78, by(foreign) c(ll) ylab(0,35)

     Graphs mean mileage against repair record, separately for foreign and
     domestic autos.

     . catgraph mpg rep78, by(foreign) c(ll) ylab(0,35) stat(median)

     Graphs median mileage against repair record, separately for foreign and
     domestic autos.

Author

     Nick Winter
     Cornell University
     nw53@cornell.edu