Re: [R] FW: Levels and GLM

From: Peter Dalgaard <p.dalgaard_at_biostat.ku.dk>
Date: Sat 08 Jul 2006 - 07:23:01 EST

"Kuhn, Max" <Max.Kuhn@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             ุster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)                  FAX: (+45) 35327907

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Received on Sat Jul 08 08:37:52 2006

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