aggregate(x$varA, by=list(x$year, x$name), mean)
On 12/13/05, Sérgio Nunes [EMAIL PROTECTED] wrote:
Hi,
I'm pretty new to R and I've been having some problems filtering data
in matrices.
I have the following initial dataset:
|| year | name | varA ||
I have multiple values for varA for the same year and the same name.
Having this as the input I would like to obtain the following:
|| year | name | {varA mean} ||
Where I only have one line for each year and name with the mean of
the values of varA in varA mean.
Is there a simple way to achieve this without using control structures
(for or while cycles)?
Thanks in advance for any help.
Best regards,
Sérgio Nunes
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What the problem you are trying to solve?
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