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...any nice and simple ways doing this? If so, how? If not, I'd be grateful for receiving some hints on how this can be accomplished. Many thanks, Henric --------------------------------------------------------------------------------------- Henric Nilsson, Statistician Statisticon AB, ?stra ?gatan 31, SE-753 22 UPPSALA Phone (Direct): +46 (0)18 18 22 37 Mobile: +46 (0)70 211 68 36 Fax: +46 (0)18 18 22 33 <http://www.statisticon.se>

...a.1--a.3 are dummy variables representing each level of the factor? Or is the s(x) term redundant? Any hints are greatly appreciated. Best wishes, Henric --------------------------------------------------------------------------------------- Henric Nilsson, Statistician Statisticon AB, ?stra ?gatan 31, SE-753 22 UPPSALA Phone (Direct): +46 (0)18 18 22 37 Mobile: +46 (0)70 211 68 36 Fax: +46 (0)18 18 22 33 <http://www.statisticon.se>

...n overall test. (Perhaps with the addition of a choice between Type I and Type III tests, but I guess that may be controversial). Is it possible? //Henric --------------------------------------------------------------------------------------- Henric Nilsson, Statistician Statisticon AB, ?stra ?gatan 31, SE-753 22 UPPSALA Phone (Direct): +46 (0)18 18 22 37 Mobile: +46 (0)70 211 68 36 Fax: +46 (0)18 18 22 33 <http://www.statisticon.se>

Dear R users: How can I use panel.qqmathline, in package lattice, to add straight lines onto the plots generated by qqmath? I read help pages of qqmath, panel.qqmathline, xyplot, ..., but just can't one example that shows how to make it work. For example, > data(sleep) > qqnorm(~ extra | group, data=sleep, aspect=1) how can I use panel.qqmathline? Thanks very much for your help,