Full_Name: Chris Andrews Version: 2.4.1 OS: Windows XP Submission from: (NULL) (128.205.90.25) # CDF works as expected (=0) pnorm(-Inf) # 0 plnorm(0) # 0 # specifying lower.tail=FALSE should give survival function (=1) pnorm(-Inf, lower.tail=FALSE) # 1 plnorm(0, lower.tail=FALSE) # 0 != 1