This function produces Cook's distance plots for a linear model obtained from functions aov
, lm
, glm
, gls
, lme
,
or lmer
.
1 
model 
Model object returned by 
group 
Name (in "quotes") for indicating how observations are deleted for Cook's distance calculation. If 
plot 
A logical variable; if it is true, a plot of Cook's distance will be presented. The default is TRUE. 
idn 
An integer indicating the number of top Cook's distances to be labelled in the plot. The default value is 3. 
newwd 
A logical variable to indicate whether to print graph in a new window. The default value is TRUE. 
Dongwen Luo, Siva Ganesh and John Koolaard
1 2 3 4 5 6  library(predictmeans)
Oats$nitro < factor(Oats$nitro)
fm < lme(yield ~ nitro*Variety, random=~1Block/Variety, data=Oats)
# library(lme4)
# fm < lmer(yield ~ nitro*Variety+(1Block/Variety), data=Oats)
CookD(fm)

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