[R] calculating std err (SEM)?
Kirk R. Wythers
kwythers at umn.edu
Fri Mar 1 16:15:45 CET 2002
Is there a "canned" function in R for finding the standard error of the
mean? I have tried
> sem <- function(x) c(mean =mean(x),
+ SEM = stdev(x)/sqrt(length(x)))
Error in sem(pnet.lai) : couldn't find function "stdev"
It looks like there is no stdev function in R
Kirk R. Wythers email: kwythers at umn.edu
University of Minnesota tel: 612.625.2261
Department of Forest Resources fax: 612.625.5212
Saint Paul, MN 55108
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