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2004 Jun 15
4
"Glueing" factors together
Hi folks,
Suppose I have a series of cases each with categorical
factors A, B.
What is the best way to "glue" A and B together into a single
factor? For example, given
A0 B1 ...
A1 B1 ...
A0 B2 ...
A1 B0 ...
A0 B0 ...
A1 B2 ...
then I'd like to end up with a single factor with levels
A0B0, A0B1, A0B2, A1B0, A1B1, A1B2
according to all the combinations which actually occur in