[R] Influence measure + lme ?
spencer.graves at pdf.com
Sat Jan 21 17:51:35 CET 2006
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
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.
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]]
> R-help at stat.math.ethz.ch mailing list
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
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