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...k for the presence of tcltk and stop if it is found before mclapply() is used. I wish you would please review my suggestion below. Maybe checkForTcltk() could be used in the parallel package. Otherwise, we are letting people run with scissors. There's a warning about this in ?mclapply It is _strongly discouraged_ to use these functions in GUI or embedded environments, because it leads to several processes sharing the same GUI which will likely cause chaos (and possibly crashes). Child processes should never use on-screen graphics devices.(Warning in ?mclapply) Bug report: (htt...

Hi Peter and others, If it helps, I wrote a small function glm.scoretest() for the statmod package on CRAN to compute score tests from glm fits. The score test for adding a covariate, or any set of covariates, can be extracted very neatly from the standard glm output, although you probably already know that. Regards Gordon --------------------------------------------- Professor Gordon K