[R] convert day of week from number to character and include in lm

Ferdinand Alimadhi falimadhi at iq.harvard.edu
Fri Oct 6 02:22:23 CEST 2006

lm(dep ~ as.factor(WKDY)

but if you want WKDYs as character you can make the appropriate changes 
in your dataset

 > days<-c("mon","tue","wed","thu","fri","sat","sun")
 > for(i in 1:7)
+ D$WKDY[D$WKDY==i]<-days[[i]]

suppossing that D is your dataframe


Spencer Jones wrote:

>I am trying to include a day of week variable (1-7) in in a regression
>model. I would like to have the day of week treated as a categorical
>variable rather than a number
>the code looks like
>lm( dep ~ WKDY)
>I know this is a basic question, but help would be appreciated
>	[[alternative HTML version deleted]]
>R-help at stat.math.ethz.ch mailing list
>PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.

Ferdinand Alimadhi
Programmer / Analyst
Harvard University
The Institute for Quantitative Social Science
(617) 496-0187
falimadhi at iq.harvard.edu

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