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st: Generate new var - sum of multiple var

From   Jonathan Grondin <>
Subject   st: Generate new var - sum of multiple var
Date   Tue, 23 Aug 2011 11:20:09 -0400

Hello everyone,

I have a 4 questions survey(q1, q2, q3, q4). Each one of the 4
questions can either be answered by 1 or by 0.
I'd like to generate a new variable(new_var) holding, for every
participants, the number of question they answered with the value 1.
In other word, the sum of the 4 questions.

new_var would then hold values from 0 to 4

Any suggestions ?

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