[R] FW: Levels and GLM

Peter Dalgaard p.dalgaard at biostat.ku.dk
Fri Jul 7 23:23:01 CEST 2006

"Kuhn, Max" <Max.Kuhn at pfizer.com> writes:

> One correction... since you are fitting a logistic model, it is 
> technically correct to say the "mean value of the linear predictor," 
> instead of "mean response".
> 20 lashes for me.

...plus five more for forgetting that the link is nonlinear and that
you can't meaningfully speak about the mean on the linear predictor
scale. "Value of linear predictor corresponding to the mean response"
is correct (I hope...)

> So level "M" is the "reference cell". Assuming that 
> data.logistic$Overall is continuous, the intercept is the estimate of 
> the mean response when maj = "M" and data.logistic$Overall = 0. The 
> estimate for majN is the difference between the reference cell

   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907

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