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Dear Developers, I would like to contribute to the R Project. I implemented a C function the can be used to calculate minimal detectable differences for general ANOVA models (sample size calculations, power analysis). A demo program and the source code is available from my website: http://reliablecomputing.eu/ncbeta.html What should i do in order to make my ncbeta function part of the R project source distribution? Probably the most troublesome parts of my code are those where error may occur, i do not know much about the proper error handling in R. Many thanks, Ali P.S. I see my suggestions htt...

Dear Developers, The pnbeta function has been reviewed recently in the article of A. Baharev, S. Kem?ny, On the computation of the noncentral F and noncentral beta distribution, Statistics and Computing, 2008, in press. Preprint of the paper is available here: http://reliablecomputing.eu/publications.html and the article here http://dx.doi.org/10.1007/s11222-008-9061-3 I suggest increasing the itrmax to (at least) 2000, since practically important values cannot be computed with the current value. For example: pnbeta(0.99992057, 25.0, 0.5, 34012.98, 1, 0); needs 1649 iterati...

Dear Developers, The pnbeta function has been reviewed recently in the article of A. Baharev, S. Kem=E9ny, On the computation of the noncentral F and noncentral beta distribution, Statistics and Computing, 2008, in press. Preprint of the paper is available here: http://reliablecomputing.eu/publications.html and the article here http://dx.doi.org/10.1007/s11222-008-9061-3 I suggest increasing the itrmax to (at least) 2000, since practically important values cannot be computed with the current value. For example: pnbeta(0.99992057, 25.0, 0.5, 34012.98, 1, 0); needs 1649 iterati...