> The manual formula mean that how to calculate that value by hand for > TINV(0.0000408831, 1221) and the resulted is 4.0891672
This is not really an R help question - you're specifically asking for something that _doesn't_ use R - but if you want to know how R does it the full C and R code for pt and qt in R (the cumulative probability distribution and the inverse, quantile, function respectively) is available in the R source code, which you can obtain from CRAN; see http://CRAN.R-project.org/mirrors.html - see the source code link from any of the listed mirrors. S Ellison ******************************************************************* This email and any attachments are confidential. Any use...{{dropped:8}} ______________________________________________ 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.
