AllenL wrote:
Searched for "by" in forums and no hits, should be simple problem.
This is my line:
bio.mean<-by(Data,Plot, function(x) mean(AbvBioAnnProd))
I want to calculate the mean of "AbvBioAnnProd" in each Plot. What am I
doing wrong?
What is AbvBioAnnProd? I only see that you pass Data, Plot and the parts
of Data subscripted by Plot as x into the anonymous function, but
there is no AbvBioAnnProd that mean can use so far ...
You need to tell us why R should know anything about that object.
Uwe Ligges
Thanks in advance,
-AL
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