Message-ID: <1014995745.5470.12.camel@lorax.forestry.umn.edu>
Date: 2002-03-01T15:15:45Z
From: Kirk R. Wythers
Subject: calculating std err (SEM)?
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)))
> sem(pnet.lai)
Error in sem(pnet.lai) : couldn't find function "stdev"
It looks like there is no stdev function in R
Thanks,
Kirk
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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