st: combining panel data values

[Sean Lunde <sean.lunde@gmail.com>]

Hi,

I am working with a set of panel data grouped by brand (the panel var)  
and date (the time var). I want to combine the values of some of the  
brand variables together,( e.g. combine the salesdollar value for  
brand x with salesdollar value for brand y). All of the variables I  
want to combine are numeric.


Thanks,

Sean Lunde
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