st: summing variables

[P chrisman <peggyc@u.washington.edu>]

Dear List,

I need to find the total mg of a treatment received for each subject. I 
have mg of treatment drug as variables mg_1 for the first dose received 
through mg_108 for the last dose received. I would normally just create 
a variable, e.g. gen totalmg= mg_1 + mg_2 to find the total, but since I 
have 108 doses to sum, I am wondering if there is a more efficient way 
to create the totalmg?

Thanks,
pc
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