I stumbled on the following:
> library(stats4)
> example(mle)
> confint.default(fit2)
Error in UseMethod("vcov") : no applicable method for "vcov"
In addition: Warning message:
In object$coefficients :
$ operator not defined for this S4 class, returning NULL
> vcov(fit2)
lymax lxhalf
lymax 0.02857612 -0.04870231
lxhalf -0.04870231 0.11457338
> coef(fit2)
lymax lxhalf
3.218870 1.117006
And confint.default does indeed use the generic extractors vcov() and
coef().
Q: is this to be expected? and why? (I kind of suspect that this has in
fact been discussed at some point and that I just wasn't paying
attention...)
--
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
~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
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