In version 2.2.0, plot.lm() was enhanced with two new plots (thanks, Martin and John). There's a small fix needed for 'which=6' when 'id.n=0'. > plot(lm(rnorm(10) ~ 1), which = 6, id.n = 0) Error in plot.lm(lm(rnorm(10) ~ 1), which = 6, id.n = 0) : could not find function "text.id" Fixed by inserting braces in plot.lm.R: Replace code at line last-8: if (id.n > 0) show.r <- order(-cook)[iid] text.id(g[show.r], cook[show.r], show.r) with if (id.n > 0) { show.r <- order(-cook)[iid] text.id(g[show.r], cook[show.r], show.r) } > version _ platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status Patched major 2 minor 4.0 year 2006 month 10 day 29 svn rev 39744 language R version.string R version 2.4.0 Patched (2006-10-29 r39744) Peter Ehlers