[R] Binomial Reponses
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Fri Oct 22 15:12:00 CEST 1999
R.E.Darnell at newcastle.ac.uk (R.E. Darnell) writes:
> I understand that there are two ways to define the response for
> binomial case in R(S).
> 1) As a vector of p's for which the number of trials is assumed
> to be 1
> 2) As a 2 column matrix, the first being the number of sucesses, the
> second being the number of failures.
3) as a vector of p's, the number of trials given in the weights=
argument
> Two questions I have concern the 2nd case.
>
> Does the model.response function convert the number of successes
> into a propn? I couldn't see that it did.
Nope. That's not it's job. It just pulls out the relevant bits of the
model frame.
> and how is the denominator included as a (prior) weight?
Have a look at the initialize expression as defined in binomial().
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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