"X. Cong" <[EMAIL PROTECTED]> writes: > Dear all, > > I am trying to use the > rstable(n, alpha, beta, gamma = 1, delta = 0, pm = c(0, 1, 2))) > > function to generate positive stable random numbers. For positive stable > distribution, beta==1 and alpha is in (0,1), which defines random variables > with support (0, infinity). So, I used rstable(100, 0.5, 1) for an example. > I found that this gives me some negative numbers. For example, > > > rstable(10, 0.5, 1) > [1] 6.3016252 399.3659030 11.2735789 1.9550625 -0.6762333 1.6810761 > [7] 0.9091360 1.9100991 -0.7593737 24.2788471 > > Does anybody know why this should happen?
Doesn't sound like it should... >From where did you get rstable()? It isn't part of R itself, and poking around shows at least three different sources for it (CircStats, fBasics, stable (Lambert/Lindsey, not on CRAN)). I seem to recall that the third one also has a distribution function which is almost, but not quite monotone. The usual advice of taking package problems to the package maintainer applies. -- 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
