SGplot keylegend help

[magicdj]

i have similar situation in link below. my question is this is individual plot with many lines.

but for legend, i just want to specify the color by group.

for example, in FreelanceReinh Jade's post: 

series x=avisit y=aval / group=usubjid attrid=myid;

 for legend, instead of list usubjids, just want to list legend as blue for trta='A' and red for trta='B'. how do i do that? thanks.

Solved: How Can I Specify Line Colors per Group in SG Plot? - SAS Support Communities

[DanH_sas · Accepted solution]

You need to use a secondary classifier on the SERIES plot, and tell the legend to show only the line color. Here is an example using the data from the other post:

data test;
    input usubjid$ trta$ avisit$ aval;
    datalines;
    xx-01 A Day1 10
    xx-01 A Day5 11
    xx-02 A Day1  9
    xx-02 A Day5 10
    xx-03 B Day1 20
    xx-03 B Day5 17
    xx-04 B Day1 19
    xx-04 B Day5 21
    ;
run;
proc sgplot data=test;
    series x=avisit y=aval / group=usubjid grouplc=trta;
    keylegend / type=linecolor title="TRTA";
run;