Re: [R] call step inside a function

Thomas Lumley Mon, 04 Oct 2004 14:41:46 -0700

On Mon, 4 Oct 2004, weihong wrote:

program

function(dataset)
{
       tmp<-glm(weta~1, family=poisson, data=dataset)
       tmp.f<-step(tmp,~.+jd)
}

When I run program(data) in 1.9.0, an error message appears:

Error in model.frame.default(formula = WETA ~ jd, data = dataset,
drop.unused.levels = TRUE) :
       Object "dataset" not found

Yes, it looks as though add1.glm is not putting the environment information in the same place that model.frame.glm is looking for it.

add1.glm sets up an empty shell of a glm object and calls model.frame.glm, but model.frame.glm uses the $terms component to specify the environment, and add1.glm doesn't give a $terms component. Presumably at some time in the past model.frame.glm used the $call$formula component instead.


    -thomas

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Re: [R] call step inside a function

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