I am using the rcor.test function available in the ltm package and wanted to know if there was a way to use this function to compute the correlation of two datasets that are not of equal length (similar to the base cor function). I was thinking an apply function like by might work but so far I have had no luck getting it to work.I was wondering if anyone could give me some general advice on this. Damion Nero Plant Molecular Biology Lab Department of Biology New York University