From: Jim Lindsey <jlindsey@luc.ac.be> Message-Id: <9704300754.AA19200@alpha.luc.ac.be> Subject: R-beta: Small problems with R0.49 To: r-testers@stat.math.ethz.ch (r-testers) Date: Wed, 30 Apr 1997 09:54:53 +0200 (MET DST) Problems: 1. A gentle reminder that the default has not been changed for saving .RData in batch mode (as was promised). 2. The degrees of freedom for the null deviance in glm are wrong when some observations are weighted out. This can give silly answers, for example when applying anova. The number of weighted out observations should be subtracted, as in other df calculations. 3. The null deviance itself is wrong in glm when an offset is used. It can be smaller than that when variables are added to the model! 4. R gave a segmentation fault when I tried to fit a model with 49 factor levels in glm (using R -v4). All these glm problems were with poisson. 5. R still does not read my environmental variables to set memory size. 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. Jim =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= 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 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=