> daply(data.test, .(municipality, employed), function(d){mean(d$age)} )
> employed
> municipality no yes
> A 41.58759 44.67463
> B 55.57407 43.82545
> C 43.59330 NA
>
> The .drop argument has a different meaning in daply. Some R functions have
> an na.last argument, and it may be that somewhere in daply, there is a
> function call that moves all NAs to the end. The means are in the right
> order except for the first, where the NA is supposed to be, so everything is
> offset in the table by 1. I've cc'ed Hadley on this.
This is a bug, which I've fixed in the development version (hopefully
to be released next week).
In the plyr 1.2:
> daply(data.test, .(municipality, employed), function(d){mean(d$age)} )
employed
municipality no yes
A NA 39.49980
B 44.69291 51.63733
C 57.38072 45.28978
Hadley
--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/
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