[R] need help creating means table

[Peter Dalgaard BSA]

David White <dwhite at ling.ohio-state.edu> writes:

> Hello,
> 
> 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,

How about 

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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