Cook's Distances for Linear and Generalized Linear Models
This function now simply calls
cooks.distance in the
- other arguments to be passed to
Cook's distances for generalized linear
models are approximations, as described in Williams (1987) (except that the Cook's distances are
scaled as F rather than as chi-square values).
This function is retained primarily for consistency with An R and S-PLUS Companion
to Applied Regression. Other deletion diagnostics formerly in the
car package have
been rewritten and moved to the
base package; these include
cookdreturns a vector with one entry for each observation.
Cook, R. D. and Weisberg, S. (1984) Residuals and Influence in Regression. Wiley. Fox, J. (1997) Applied Regression, Linear Models, and Related Methods. Sage. Williams, D. A. (1987) Generalized linear model diagnostics using the deviance and single case deletions. Applied Statistics 36, 181--191.
data(Duncan) attach(Duncan) mod <- lm(prestige ~ income + education) plot(cookd(mod))