tom soyer wrote: > Hi, > > I am trying to find a function in R that would calculate the critical value > of t for a given probability and df. For example, if p=5% and df=20, then > does R have a function to calculate the t value? I tried: > > >> dt(0.05,df=20) >> > [1] 0.3934718 > > That doesn't look right to me. Could someone tell me what I was missing? > > Thanks, > > qt()
Notice that it gives only one tail (to the left by default), so you need p/2 for two-sided tests. -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
