peter, thanks for your help with my questions regarding cor.test(). i have another question though: does this function make any assumptions about the underlying distribution of the two sequences? does it assume that they have a gaussian distribution? i ask because the data that i am working with is two binary sequences. just series of 0 and 1. will the confidence intervals and p-values generated by cor.test() still apply? cheers, andrew. ---------------------------------------------------------------------- Get a free email account with anti spam protection. http://www.bluebottle.com/tag/2