[R] how to get the numbers of factors in a matrix

peter dalgaard pdalgd at gmail.com
Tue Jan 21 20:11:49 CET 2014

On 21 Jan 2014, at 15:58 , Jeff Newmiller <jdnewmil at dcn.davis.ca.us> wrote:

> You are mis-using factors. Would you pretend that women do not exist just because your sample happens to include only men?
> If you really need to ignore those other levels, convert your factor to character and summarize those values.

Actually, just factor(fff) will do. Or droplevels(fff).

Peter Dalgaard, Professor
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com

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