Date: Wed, 30 Apr 1997 10:20:22 +0200 Message-Id: <199704300820.KAA17727@aragorn.ci.tuwien.ac.at> From: Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at> To: Jim Lindsey <jlindsey@luc.ac.be> Subject: Re: R-beta: Small problems with R0.49 In-Reply-To: <9704300754.AA19200@alpha.luc.ac.be> >>>>> Jim Lindsey writes: > Suggestions: > 1. d, p, q, and r functions for inverse Gauss and Laplace > distributions. > 2. Add a fifth function for continuous distributions, the hazard > function, h. For example, ht <- function(...) dt(...)/(1-pt(...)) > is the Student t hazard function. > For writing likelihood functions, these would be much faster in C than > R and some such as Weibull can be simplified. > 3. Add the five functions for three parameter distributions such as > generalized F, extreme value, etc., Box-Cox,... (I have the densities, > cumulative, and hazard as R functions.) > 4. Philippe Lambert and I have d and p functions working in R for the > four-parameter stable family by inverting the characteristic function > with a Fourier transform (requires C code). S-plus only has the r > function for stables. It would definitely be wonderful to have all these functions available. I am a bit worried about over-polluting the name space, though. (I was never too happy with pf and their likes.) -k =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request@stat.math.ethz.ch =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=