[R] need help creating means table
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Mon Sep 24 19:06:10 CEST 2001
David White <dwhite at ling.ohio-state.edu> writes:
> I have been trying to use by to create a means table, but receive the
> error " by(xx, list(subjs, cons, vowels), mean)
> Error in Summary.data.frame(..., na.rm = na.rm) :
> only defined on a data frame with all numeric or complex
> variables" when the data frame consists of three factor columns (subjs,
> cons and vowels) and 5 numeric data columns.
> The output I'm looking for is a simple mean for each of the numeric
> columns by the independent variables subjs, vowel, consonant.
> Thanks for you advice,
nums <- sapply(xx, is.numeric)
by(xx[nums], list(subjs, cons, vowels), mean)
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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