Scott Story <[EMAIL PROTECTED]> writes: > I am trying to write a function that will solve a simple system of > nonlinear equations for the parameters that describe the beta > distribution (a,b) given the mean and variance. > > > mean = a/(a+b) > variance = (a*b)/(((a+b)^2) * (a+b+1)) > > Any help as to where to start would be welcome.
On a pad of paper... First look at mean*(1-mean)/variance, and the rest should follow. (Hint minimized in case this was homework...) -- 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@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
