On Fri, Apr 4, 2008 at 11:00 AM, Muenchen, Robert A (Bob) <[EMAIL PROTECTED]> wrote: > Dear R-Helpers, > > Why does R show character missing values in vectors as NA and when > stored in a data frame as <NA>? I've searched but did not find an > explanation.
It's because that character vector is automatically coerced into a factor: > factor(gender) [1] f f f <NA> m m m m Levels: f m I'd imagine the display is different so you can tell the difference between NA and level "NA". (This isn't a problem for strings because they have quotes around them) Hadley -- http://had.co.nz/ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
