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...T_MUTABLE(x): SET_NAMED(c, NAMEDMAX) > > Best, > > luke Checking https://cran.r-project.org/doc/manuals/r-release/R-exts.html shows that currently there is no mention of these macros in the documentation for package writers. Of course, the explanation of NAMED there also does not adequtely describe what it is supposed to mean, which may explain why it's often not used correctly. Before embarking on a major change to the C API, I'd suggest that you produce clear and complete documention on the new scheme. Radford Neal

Hi: I'm working with multinomial models with library nnet, and I'm trying to get the explained deviance (pseudo R^2) of my models. I am assuming that: pseudo R^2= 1 - dev(model) / dev (null) where dev(model) is the deviance for the fitted model and dev(null) is the deviance for the null model (with the intercept only). library(nnet) full.model<- multinom(cbind(factor1,