Full_Name: Thomas Stabla Version: 1.8.1 OS: Linux, XP Submission from: (NULL) (80.136.67.200) qchisq(1, df = 1, ncp = 0) seems to hang for me. I tried R 1.7.1, R 1.8.1 and R-Devel 1.9.0 under Linux (suse 8.0) and R 1.8.1 under XP