R help - Oct 2006 - convert day of week from number to character and include in lm

All,

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

thanks

spencer

	[[alternative HTML version deleted]]

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

HTH

Spencer Jones wrote:
>All,
>
>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
>
>thanks
>
>spencer
>
>	[[alternative HTML version deleted]]
>
>______________________________________________
>R-help at 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
>and provide commented, minimal, self-contained, reproducible code.
>
>  
>

-- 
Ferdinand Alimadhi
Programmer / Analyst
Harvard University
The Institute for Quantitative Social Science
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