[R] Simple (?) subset problem

[David Scott]

My guess is that you maybe have some leading or trailing spaces in the 
direction_ variable.

Try a tabulation of the direction_ variable to see exactly what values are 
in your data set.

David Scott


On Thu, 14 Aug 2008, Farley, Robert wrote:

> I can't figure out the syntax I need to get subset to work.  I'm trying
> to split my dataframe into two parts.  I'm sure this is a simple issue,
> but I'm stumped.  I either get all or none of the original "rows".
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>> XTTable <- xtabs( ~   direction_ , SurveyData)
>
>> XTTable
>
> direction_
>
> EASTBOUND
>
>                                               345
>
> WESTBOUND
>
>                                               307
>
>> EBSurvey <- subset(SurveyData, direction_ == "EASTBOUND" )
>
>> XTTable <- xtabs( ~   direction_ , EBSurvey)
>
>> XTTable
>
> direction_
>
> EASTBOUND
>
>                                                 0
>
> WESTBOUND
>
>                                                 0
>
>> EBSurvey <- subset(SurveyData, direction_ = "EASTBOUND" )
>
>> XTTable <- xtabs( ~   direction_ , EBSurvey)
>
>> XTTable
>
> direction_
>
> EASTBOUND
>
>                                               345
>
> WESTBOUND
>
>                                               307
>
>> EBSurvey <- subset(SurveyData, direction_ == 1 )
>
>> XTTable <- xtabs( ~   direction_ , EBSurvey)
>
>> XTTable
>
> direction_
>
> EASTBOUND
>
>                                                 0
>
> WESTBOUND
>
>                                                 0
>
>>
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> Robert Farley
>
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_________________________________________________________________
David Scott	Department of Statistics, Tamaki Campus
 		The University of Auckland, PB 92019
 		Auckland 1142,    NEW ZEALAND
Phone: +64 9 373 7599 ext 86830		Fax: +64 9 373 7000
Email:	d.scott at auckland.ac.nz

Graduate Officer, Department of Statistics
Director of Consulting, Department of Statistics