On 15 Sep 2015, at 15:26 , jlu...@ria.buffalo.edu wrote: > Your question makes no sense as stated. However, guessing at what you > want, you should perhaps consider the non-central chi-square density with > 1 df and ncp = u/a, i.e, > > rchisq(100, df=1, ncp=u/a)
Something's not right with that. Noncentral chisquare has mean df+ncp and variance 2*df + 4*ncp, which doesn't work out as anything like u and a^2. Other possibilities include gamma and lognormal distributions. -pd > > Joe > > > > Joseph F. Lucke, PhD > Senior Statistician > Research Institute on Addictions > University at Buffalo > State University of New York > 1021 Main Street > Buffalo, NY 14203-1016 > > > > > > > Chien-Pang Chin <chienpan...@gmail.com> > Sent by: "R-help" <r-help-boun...@r-project.org> > 09/15/2015 06:58 AM > > To > "r-help@r-project.org" <r-help@r-project.org>, > cc > > Subject > [R] Beta distribution approximate to Normal distribution > > > > > > > Hi, > > I need to generate 1000 numbers from N(u, a^2), however I don't want to > include 0 and negative values. How can I use beta distribution approximate > to N(u, a^2) in R. > > Thx for help > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Office: A 4.23 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
