st: use loop to add plots to scatter plot

["Harris, Linda J" <ljharris@scharp.org>]

I have macros with names `antigen01' to `antigen40'

I want to create a two way graph with the following:

1)   scatter plots with a variable # of these items (approx 5 and not in numeric order), each with a different marker
2)   linear fits for the same items, with lines in the same color as the markers
3)   a linear fit that is based on the aggregate selection of items following to a selection of these antigens (say approx 5):

If possible, I would like to use a loop with a foreach statement rather than having to modify the specific items and # of items each time i ran this.
I know that the last line is wrong - just have no idea how to accomplish this


This is my first posting - hope I've done it right!  I'm also new to Stata programming, so hope this isn't too trivial a question.

example  - say want `antigen01',  `antigen04'  `antigen05'

twoway  ///
(scatter yvar xvar if ANTIGEN==`antigen01', mcolor(red)) ///
(lfit yvar xvar if ANTIGEN==`antigen01', lcolor (red)) ///
(scatter yvar xvar if ANTIGEN==`antigen04', mcolor(green)) ///
(lfit yvar xvar if ANTIGEN==`antigen04'), lcolor(green) ///
(scatter yvar xvar if ANTIGEN==`antigen05', mcolor(blue)) ///
(lfit yvar xvar if ANTIGEN==`antigen05', lcolor(blue)) ///
(lift yvar xvar if ANTIGEN oneof [`antigen01' `antigen04'  `antigen5'], lcolor(black))

Thank you,
Linda
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