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..., but they require (i think) me to do my own scaling as they are scaled to the graphics window. any advice on which approach I should take (just bite the bullet and do my own scaling), or is there something else I should try, or any examples I should look at. many thanks for any pointers. bernie leemon (aka gary mcclelland) [[alternative HTML version deleted]]

...s of those codes are easily interpreted as the simple difference for one contrast when the other contrast is fixed at some level. Multiple degree of freedom omnibus tests are troublesome but are only of interest if we are fixated on concepts like 'main effect.' gary mcclelland (aka bernie leemon) colorado [[alternative HTML version deleted]]

I'm sure this must be a nls() newbie question, but I'm stumped. I'm trying to do the example from Draper and Yang (1997). They give this snippet of S-Plus code: Specify the weight function: weight < - function(y,x1,x2,b0,b1,b2) { pred <- b0+b1*x1 + b2*x2 parms <- abs(b1*b2)^(1/3) (y-pred)/parms } Fit the model gmfit < -nls(~weight(y,x1,x2,b0,b1,b2),

...on (Gabor Grothendieck) 5. Do I need to use dropterm()?? (DaniWells) 6. Re: Using 'sapply' and 'by' in one function (Gabor Grothendieck) 7. Re: R on Mac PRO does anyone have experience with R on such a platform ? (Rod) 8. Re: Do I need to use dropterm()?? (Bernard Leemon) 9. Re: Which package should I use if I estimate a recursive model? (John Fox) 10. Re: Using 'sapply' and 'by' in one function (hadley wickham) 11. Error in optim while using fitdistr() function (Jason Q. McClintic) 12. Re: Using 'sapply' and 'by...