I think the following three calls to na.action() should return the same thing, but the last returns NULL.
> d <- data.frame(x=c(1,2,NA,NA,5), y=log(1:5), row.names=LETTERS[1:5]) > na.action(na.exclude(d)) C D 3 4 attr(,"class") [1] "exclude" > na.action(model.frame(y~x, data=d, na.action=na.exclude)) C D 3 4 attr(,"class") [1] "exclude" > na.action(fit <- lm(y~x, data=d, na.action=na.exclude)) NULL lm() returns a list component called "na.action" while na.exclude() and model.frame() return the same thing as an attribute called "na.action". > fit$na.action C D 3 4 attr(,"class") [1] "exclude" Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
