Hi, Actually, pchisq(q,df) calculates the cumulative distribution function by default.
To calculate the p-value, you can use either 1-pchisq(q,df) or pchisq(q,df,lower.tail=FALSE) PS: I checked, the p value yielded by R and the calculator for which you give a link, for some "q" and "df" values, and these two are same. Best Ozgur -- View this message in context: http://r.789695.n4.nabble.com/How-to-calculate-chi-sqaure-value-from-statistical-value-and-degrees-of-freedom-tp4632385p4632470.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
