[R] Calculate a mean for several months for several years

[Pete Brecknock]

For 5 years ....

set.seed = 1
d=data.frame(year=rep(2007:2011,each=12), month=rep(1:12,5), meanTemp =
rnorm(60,10,5))
meanByMonth = ave(d$meanTemp, d$month, FUN = mean)[7:9]

HTH

Pete
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