Message-ID: <C83C5E3DEEE97E498B74729A33F6EAEC056300BB@DJFPOST01.djf.agrsci.dk>
Date: 2009-01-11T23:15:17Z
From: Søren Højsgaard
Subject: summary with variance / sd
You can use summaryBy() in the doBy package:
summaryBy(y+x~group, data=mydata, FUN=c(mean,sd))
S?ren
________________________________
Fra: r-help-bounces at r-project.org p? vegne af J?rg Gro?
Sendt: s? 11-01-2009 22:38
Til: r-help at r-project.org
Emne: [R] summary with variance / sd
Hi,
I have a data frame and would like to have summary statistics for
grouped data.
With summary() I get the central tendencies for the overall data.
How can I get descriptive statistics with variances and standard
deviations?
for example my data.frame:
group x y
exp 2 4
exp 3 5
exp 2 4
control 1 2
control 2 3
control 1 2
now I want tables with summary statistics (variances included) for
each group.
Is there an easy way to get this?
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