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produc
2005 Apr 13
2
extracting one element of correlation matrices from a list poroduced by the 'by' statement
I am producing 2X2 correlation matrices by a class variable. I need to
extract a vector of correlation coefficients only. I am doing that in a
loop (see below) but I am sure there would be a simpler way. Please
help!
> by(d1[,c(2,3)],d1[,1],cor)
d1[, 1]: 1
c e
c 1.0000000 0.1972309
e 0.1972309 1.0000000