[R] "Glueing" factors together
p.dalgaard at biostat.ku.dk
Tue Jun 15 10:35:29 CEST 2004
(Ted Harding) <Ted.Harding at nessie.mcc.ac.uk> writes:
> 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 the
> data (e.g. if (A1,B2) did not occur in the data, then A1B2 would
> not be a level in the resulting "glued" factor).
> I can see clumsy and tedious ways involving manipulating strings,
> paste(), etc.; but I'm sure it must be possible more elegantly.
You mean like interaction()?
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
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