On Mon, 13 Feb 2006 17:11:30 -0500, He, Yulei wrote: HY> Hi, there. HY> HY> HY> HY> Does anyone know the R function for calculating the cdf of HY> bivariate normal distribution function? HY> HY> choose among packages "mvtnorm" and "mnormt" the one best suited for your purpose best wishes, Adelchi Azzalini