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st: Count presence of item on different vars
I've got a set of variables v6-v146, each one containing string values
(unique values ~4500):
v6 v7 v8 v9 v10...
text1 text1 text3 text45 text1...
text5 text2 text1 text455 text1
I want to count how many times each of the values appears in at least
one of the v6-v146 in each row [observation], e.g. text1 appears at
least once in 7365obs.
How can achieve this?
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