First put > day.names <- c("sun", "mon", "tue", "wed", "thu", "fri", "sat")
then > days <- factor(as.character(days), levels = day.names) will ensure the ordering you want. Bill Venables. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Eric C. Jennings Sent: Saturday, 16 April 2005 2:29 PM To: R-help Subject: [R] "chronological" ordering of factor in lm() and plot() I am trying to do some basic regression and ANOVA on cycle times (numeric vectors) across weekdays (character vector), where I have simply labelled my days as: days<- c("mon","tue","wed"...etc). (NOTE: There are actually multiple instances of each day, and the data is read-in from a .dat file.) I have no trouble at all with the actual number crunching, It is the "proper" ordering of the factor that I am asking about. R first alphabetizes it("fri","mon","thu"...) before doing the work of lm(), aov() and especially plot(). I have tried as.ordered(factor( )), but that doesn't do anything. If I re-assign levels() in the way that I want, that just renames the the levels of the factor but does not reorder it internally. I've looked at chron(), but that seems to entail using a numeric vector instead of a character vector. How can I get it to "properly" (chronologically) order the factor. (In some ways I'm thinking that all I can do is: days<- c("a.mon","b.tues","c.wed"...etc) Thanks for all that you can do Eric Jennings [EMAIL PROTECTED] [EMAIL PROTECTED] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html