On 2/19/06, Robert W. Baer, Ph.D. <[EMAIL PROTECTED]> wrote: > Quoted directly from the FAQ (although granted I need to look this up over > and over, myself. Would that it had a easily remembered wrapper function): > 7.10 How do I convert factors to numeric? > It may happen that when reading numeric data into R (usually, when reading > in a file), they come in as factors. If f is such a factor object, you can > use > > as.numeric(as.character(f)) > to get the numbers back. More efficient, but harder to remember, is > > as.numeric(levels(f))[as.integer(f)]
I don't think I have that problem described in the FAQ. I've had that before, though. Observe. Here's the original thing: > eldatfac$HAPPY[1:10] [1] Happy Happy Very happy Happy Very happy Very happy [7] Happy Very happy Happy Very happy 6 Levels: Not happy at all Not very happy Happy Very happy ... Refused Here's the result of the first thing you cite from the FAQ > as.numeric(as.character(eldatfac$HAPPY))[1:10] [1] NA NA NA NA NA NA NA NA NA NA Warning message: NAs introduced by coercion Here's the second thing from the FAQ > as.numeric(levels(eldatfac$HAPPY))[as.integer(eldatfac$HAPPY)] [1] NA NA NA NA NA NA NA NA NA NA Warning message: NAs introduced by coercion What am I missing here? -- Paul E. Johnson Professor, Political Science 1541 Lilac Lane, Room 504 University of Kansas ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
