Re: [R] Influence measure + lme ?

From: Spencer Graves <spencer.graves_at_pdf.com>
Date: Sun 22 Jan 2006 - 03:51:35 EST

          My search just now found no mention of Cook's distance or influenc measures. The closest I found was an unanswered question on this from April 2003 (http://finzi.psych.upenn.edu/R/Rhelp02a/archive/4797.html).

          Beyond that, there is an excellent discussion of "Examining a Fitted Model" in Sec. 4.3 (pp. 174-197) of Pinheiro and Bates (2000) Mixed-Effects Models in S and S-Plus (Springer). Pinheiro and Bates decided NOT to include plots of Cook's distance among the many diagnostics they did provide. However, 'plot(fit.lme)' plots 'standardized residuals' vs. predicted or 'fitted values'. Wouldn't points with large influence stand apart from the crowd in terms of 'fitted value'?

          Of course, there are many things other one could do to get at related information, including reading the code for 'influence' and 'lme', and figure out from that how to write an 'influence' method for an 'lme' object. However, that is far beyond what you asked and what I have time now to disucss.

	  Hope this helps.
	  spencer graves
	

Chia, Yen Lin wrote:

> Hi all,
>
>
>
> Does lme has function to compute the cook's distance or influence
> measure like lm? I can't find them. Thanks.
>
>
>
> Yen Lin
>
>
> [[alternative HTML version deleted]]
>
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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 Received on Sun Jan 22 04:00:10 2006

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