[R] Mutliple sets of data in one dataset....Need a loop?

[David Freedman]

You'll probably want to look at the 'by' function

d=data.frame(sex=rep(1:2,50),x=rnorm(100))
d$y=d$x+rnorm(100)
head(d)
cor(d)
by(d[,-1],d['sex'],function(df)cor(df))

You might also want to look at the doBy package
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