Daer All,
I have a factor variable, X with 5 levels. When I type tables(X) it gives me:
table(X)
1 2 3 4 5
10 5 0 0 0
How to drop the levels with zeros such that when I will type:
table(X) it will give me:
table(X)
1 2
10 5
Thank a lot,
Bernard
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