Hi, how can I solve a problem without the function t.test??? for example: x<-(1,3,5,7) y<-(2,4,6) t.test(x,y,alternative="less",paired=FALSE,var.equal=TRUE,conf.level=0.95) -- View this message in context: http://www.nabble.com/t.test-tf4034225.html#a11460445 Sent from the R help mailing list archive at Nabble.com.