There is a problem with the "Constant Leverage" plot. Try the
following:
y <- c(8,9,7,9,6,9,5,9)
grp <-
factor(rep(1:4,each=2),labels=c('A','B','C','D'))
mod <- lm(y ~ grp)
windows()
par(mfrow=c(2,2))
plot(mod)
# Plot 5 ("Constant Leverage") has X axis labels sorted
# by the fitted value (as advertised), but the data are
# still plotted in the original order.
# This occurs in R 2.4.1 and 2.5.0 RC for windows
# but not in earlier releases
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