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0.9095
2006 Nov 07
1
Better way to create tables of mean & standard deviations
Hi
I'm trying to create tables of means, standard deviations and numbers
of observations (i) for
each laboratory (ii) for each batch number (iii) for each batch at
each laboratory for the attached data.
I created these functions:
summary.aggregate <- function(y, label, ...)
{
temp.mean <- aggregate(y, FUN=mean, ...)
temp.sd <- aggregate(y, FUN=sd, ...)
temp.length <-