Dear all, I've the following data.frame GENDER MEASURE01 MEASURE02 MEASURE03 MEASURE04 MEASURE05 MEASURE06 R. Rafuse MALE 9 1 6 8 1 2 T. Leiker MALE 6 7 1 8 0 0 E. Bizot FEMALE 9 8 2 9 8 8 K. French MALE 7 9 0 5 9 9 E. Van Landuyt MALE 7 1 6 2 8 9 K. Harrell FEMALE 6 0 0 8 3 1 W. Noren FEMALE 7 4 3 2 5 7 W. Willden MALE 9 9 2 6 6 8 S. Kohut FEMALE 7 8 2 3 6 9 I'd like to run an indipendent t test with the MEASURE01-MEASURE06 as dipendent variable and GENDER as grouping variable. Namely, I wish to compare means all variables in the gorup male and female. Could you help me to find the right R command? Bests -- View this message in context: http://r.789695.n4.nabble.com/Help-with-t-student-test-tp4293203p4293203.html Sent from the R help mailing list archive at Nabble.com.