On Jun 12, 2011, at 03:36 , Thomas Lumley wrote: > On Sun, Jun 12, 2011 at 12:44 PM, Tiago Pereira > <tiago.pere...@mbe.bio.br> wrote: > >> The test I am working on has an asymptotic 0.5*chi2(1)+0.5*chi2(2) >> distribution, where numbers inside parenthesis stand for the degrees of >> freedom. Is is possible to compute quickly in R the cumulative distribution >> of that distribution? >> > > There appear to be pchibar() functions in both the ibdreg and ic.infer > packages that should do want you want. Simulation is also fairly > efficient.
Assuming that you mean a 50-50 mixture of the two, it should also work just to take the average of the two CDFs. The integral is a linear operator after all. -- Peter Dalgaard Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ 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.
