[R] How to keep attributes when dropping factor levels?

Dieter Menne dieter.menne at menne-biomed.de
Thu Mar 19 14:36:34 CET 2009

Heinz Tuechler <tuechler <at> gmx.at> writes:

> to drop unused factor levels two ways are outlined in R-help. In both 
> cases a label attribute is lost.

Brian Ripley has posted this



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