David Winsemius wrote:
I think it because you are trying to use the if-else control construct,
when you should be using the ifelse function:
?ifelse
Try (perhaps):
traindev <- ifelse( (trainlength>0), round(sd(trainscores, na.rm=T),1) ,
"")
Does anything change if you rename to (say) trainsd??
You do seem to be mixing types, though, so perhaps you should use NA
instead of "".
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907
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