From: Peter Dalgaard <p.dalgaard_at_biostat.ku.dk>

Date: Wed 31 Aug 2005 - 05:55:50 EST

Date: Wed 31 Aug 2005 - 05:55:50 EST

"X. Cong" <xcong@stat.rice.edu> 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 ุster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) 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.htmlReceived on Wed Aug 31 06:05:07 2005

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