juli g. pausas wrote:
Hi,
Given a correlation matrix, how can I know which variables have certain correlation values?
aa <- matrix( rnorm(25, 1,1), 5,5) colnames(aa) <- c("v1", "v2", "v3", "v4", "v5") aacor <- cor(aa)
For instance, which variables are negatively correlated? aacor[aacor<0] # provide the r values, but how I get the variables?
Any suggestion? Thanks in advance
Juli
Juli, How about?
R> aa <- matrix( rnorm(25, 1,1), 5,5)
R> colnames(aa) <- c("v1", "v2", "v3", "v4", "v5")
R> aacor <- cor(aa)
R> negcor <- which(aacor < 0 & row(aacor) < col(aacor), TRUE)
R> apply(negcor, 2, function(x, n)
$ n[x],
$ n = colnames(aacor))
row col
[1,] "v1" "v2"
[2,] "v1" "v3"
[3,] "v2" "v3"
[4,] "v2" "v4"
[5,] "v2" "v5"
[6,] "v3" "v5"
[7,] "v4" "v5"
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