[R] How do you go beyond tapply()?
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Thu Mar 30 21:13:53 CEST 2000
Art Salwin <salwin at mitretek.org> writes:
> "An Introduction to R" notes that the function tapply() can
> be used to index a vector by multiple categories. But they
> don't show how to do this. How does one implement, for
> example, the example in the text in which tax accountants
> are indexed by both state and sex?
> Is there a way to use tapply() to put the vector into bins
> defined by the levels instead of having to exactly match the
> levels? It seems some sort of historgramming is what's
> needed, but hist() does plots, not just the categorization
> into bins.
Have a look at
tapply(x, list(state,sex), mean)
table(cut(age, breakpoints), sex)
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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