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2007 May 08
0
The match of "ave()" for "FUN=SD"
...he standard deviation
for each subset with the same factor levels. For "FUN=mean" and
"FUN=median" I am using "ave()".
Can anybody tell me the match of "ave()" for using "FUN=SD"?
At the beginning I used aggregate(), also for mean and median. But
aggregegate make ""arithmetical errors"" in computing huge records.
Thank's a lot.
Felix
R-CODE:
-------
MEAN <- ave(INPUT[,3], INPUT[,1], INPUT[,2], FUN = mean)
mMEAN <- matrix( c(INPUT[,1], INPUT[,2], MEAN), ncol=3, byrow=FALSE)
SD <- na.omit( aggregate(INPUT...