Oops... Check... http://en.wikipedia.org/wiki/Chi-square_distribution
The Chi-square distribution for _any_ df has mean = df and variance = 2df, so for large df, it's approximately a normal distribution with mean = df and sd = sqrt(2 df) [and not sqrt(df) as I wrote in a previous message that, probably, will appear after this one - Murphy rulez] Alberto Monteiro ______________________________________________ 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.
