cooks.distance.mlm | R Documentation |
The functions cooks.distance.mlm
and hatvalues.mlm
are
designed as extractor functions for regression deletion diagnostics for
multivariate linear models following Barrett & Ling (1992). These are close
analogs of methods for univariate and generalized linear models handled by
the influence.measures
in the stats
package.
## S3 method for class 'mlm' cooks.distance(model, infl = mlm.influence(model, do.coef = FALSE), ...)
model |
A |
infl |
A |
... |
Ignored |
In addition, the functions provide diagnostics for deletion of subsets of
observations of size m>1
.
A vector of Cook's distances
Barrett, B. E. and Ling, R. F. (1992). General Classes of Influence Measures for Multivariate Regression. Journal of the American Statistical Association, 87(417), 184-191.
data(Rohwer, package="heplots") Rohwer2 <- subset(Rohwer, subset=group==2) rownames(Rohwer2)<- 1:nrow(Rohwer2) Rohwer.mod <- lm(cbind(SAT, PPVT, Raven) ~ n+s+ns+na+ss, data=Rohwer2) hatvalues(Rohwer.mod) cooks.distance(Rohwer.mod)
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