Yes, same way. I had been battling before and then solved it between my post
and your response.

ICA[Strain=="49134",]
One just has to be careful to recognize that it is being handled as a
character variable and so one has to use the level label.


On 09 Sep 2006 19:08:39 +0200, Peter Dalgaard <p.dalgaard@biostat.ku.dk>
wrote:
>
> "Farrel Buchinsky" <fjbuch@gmail.com> writes:
>
> > It is easy to index on numeric variables.
> > How does one index on a variable that is a factor?
>
> Er, same way. Unless you attach some novel meaning to "index on".
> Example?
>
>
> --
>   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
> c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
> (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45)
> 35327918
> ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)                  FAX: (+45)
> 35327907
>



-- 
Farrel Buchinsky
Mobile: (412) 779-1073

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