Re: [R] advice on semi-serious attempt to extend summary

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Mon 01 Jan 2007 - 21:12:14 GMT

Try:

methods(print)
stats:::print.summary.lm

On 1/1/07, ivo welch <ivowel@gmail.com> wrote:
> Dear R wizards:
>
> I am trying (finally) to build a function that might be useful to
> others. In particular, I want to create a summary.lme (extended lm)
> method that [a] adds normalized coefficients and [b] white
> heteroskedasticity adjusted se's and T's. I believe I already know
> how to do the programming to do these two, at least in simple
> unweighted cases. Now my challenges are just [1] to trap weird cases
> (e.g., hccm dies because the standard errors cannot be computed), and
> [2] to follow "proper R rules and regulations."
>
> I started my experiments by copying summary.lm() to summary.lme. But
> there is some magic that I do not understand. Apparently, the
> class(ans) <- "summary.lm"
> signals to R that it should not produce an unlisted summary of the
> components of ans, but that it should print something that is nicely
> formatted.
> example: y=rnorm(5); x=rnorm(5); m=lm(y~x); summary.lm(m);
> does exactly this nice output. alas, just replacing the name at the end with
> class(ans) <- "summary.lme"
> and typing summary.lme(m), having renamed summary.lm to summary, then
> loses the nice printout.
>
> so, it seems to me that somewhere R knows that a "summary.lm" object
> gets special printing. if I have not misunderstood this, then where
> and how does this magic happen?
>
> advice appreciated.
>
> regards,
>
> /iaw
>
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>



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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Tue Jan 02 08:16:12 2007

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