labbig <lkaimaka <at> windowslive.com> writes:
>
> i am trying to run stepwise regression for two models(lower,upper),
> family=gamma
> and i get the same error despite the models i use.
>
> Error in UseMethod("extractAIC") :
> no applicable method for 'extractAIC' applied to an object of class
> "formula"
> In addition: Warning message:
> In nobs.default(object, use.fallback = TRUE) :
> no 'nobs' method is available
>
A reproducible example would definitely help.
The "no 'nobs' method is available" warning is a clue that you
may be using an older version of R (I believe 'nobs' was introduced
in version 2.13).
If you possibly can, update to the latest version of R and
post a reproducible example.
Ben Bolker
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