Hi Jörg,
?by
here probably something like
by(data=mydata,INDICES=mydata$group, FUN=sd, ...)
HTH,
Stephan
Jörg Groß schrieb:
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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and provide commented, minimal, self-contained, reproducible code.
