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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