[R] Within-group correlation confidence intervals

[jlwoodard]

I'm trying to obtain within-group correlations on a subset of variables. I
first selected my variables using the following command:
mydata$x<-mydata[c("iq","education","achievement")]

I'd like to look at correlations among those variables separately for men
and women. My gender variable in mydata is coded 1 (women) and 0 (men).

I have successfully used the following to get within group correlations and
p values:
by(x,gender,function(x) rcorr(as.matrix(x)))

However, I'm also interested in getting confidence intervals for the
correlations as well, using cor.test.  I tried the following without
success.

by(x,gender,function(x) cor.test(as.matrix(x)))

Even if I just use 2 variables (e.g., IQ and education), I get exactly the
same output for men and women with this command:

by(x,gender,function(x) cor.test(iq,education))

I'm still in the learning stages with the by and cor.test functions, so I
assume I'm using it incorrectly.  Is it possible to get the correlation
confidence intervals for each group using this approach?  

Many thanks in advance!

John
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