Message-ID: <4FB7AFE1.4010808@sapo.pt>
Date: 2012-05-19T14:36:17Z
From: Rui Barradas
Subject: weighted averages for two variables
Hello,
Post a data example, it will give us something to work on, and give you
better answers.
dput( head(allspecies, 20) )
Then copy the output of this and paste it in your post.
As for your problem, considering it's description, and untested (no
data), maybe
result <- by(allspecies, allspecies$Year, function(x)
weighted.mean(x$Depth, x$CPUE))
Also, note that I've renamed the result, 'data' is an R function.
Hope this helps,
Rui Barradas