[R] how to extrac one coef from lm at a time

[Douglas Bates]

Thomas Lumley <tlumley at u.washington.edu> writes:

> On Tue, 21 May 2002, Jonathan Baron wrote:
> 
> > On 05/21/02 12:07, Antonio Olinto wrote:
> > >How to extract the elevation and the slope values from a linear model (lm)
> > >separately?
> > >
> > >coef(model.lm) gives both of them.
> >
> > One way is
> > model.lm$coef[1]
> > for the intercept
> > and
> > model.lm$coef[2]
> > for the slope of the first predictor, and so on.
> 
> coef(model.lm)[2]
> or
> coef(model.lm)["x"]
> 
> are preferred -- the point of accessor functions like coef() is to hide
> the inner structure of the model object. For coef() it doesn't matter a
> lot, but there are plenty of models for which model$resid is not the same
> as resid(model).

For an nls model it matters whether you use coef(model.nls) or
model.nls$coef.
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