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...code should be: try = glm(Sepal.Length~Sepal.Width - Petal.Length - Species, data=iris); Sorry if it looks stupid... But I didn't manage to find any information on nuisance variables in R... -- *Best Regards,* *Alexander Lebedev* Stavanger University Hospital, Dept. of Psychiatry, 4011, Armauer Hansens vei 20, Stavanger, Norway. researcher [[alternative HTML version deleted]]

...0.0147536 U -0.002447 0.0005348 Q 0.028163 0.0142188 Error in Xb(x[, xcol, drop = FALSE], coef, non.slopes, non.slopes.in.x, : subscript out of bounds Any help/suggestions will be highly appreciated. Sincerely, Tore Wentzel-Larsen statistician Centre for Clinical research Armauer Hansen house Haukeland University Hospital N-5021 Bergen tlf +47 55 97 55 39 (a) faks +47 55 97 60 88 (a) email tore.wentzel-larsen at helse-bergen.no

...nal editors. I have read the posting guide and R FAQ, typed citation() in R and tried Google and R Site Search, but did not find any discussion on this matter. Sincerely, Tore Wentzel-Larsen ------------------------------------------ Tore Wentzel-Larsen statistician Centre for Clinical research Armauer Hansen house Haukeland University Hospital N-5021 Bergen tlf +47 55 97 55 39 (a) faks +47 55 97 60 88 (a) email tore.wentzel-larsen at helse-bergen.no

The following gives two functions for producing distribution graphs: distribution-graph produces a single graph, and multiple.distribution.graph produces a number of graphs side by side. Regards, Tore Wentzel-Larsen statistician Centre for Clinical research Armauer Hansen house Haukeland University Hospital N-5021 Bergen tlf +47 55 97 55 39 (a) faks +47 55 97 60 88 (a) email tore.wentzel-larsen at helse-bergen.no Documentation: distribution.graph Description distribution.graph produces a distribution graph of the data values. Usage distribution.g...