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".









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











Robert Farley

Metro

1 Gateway Plaza

Mail Stop 99-23-7

Los Angeles, CA 90012-2952

Voice: (213)922-2532

Fax:    (213)922-2868

www.Metro.net






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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:  [EMAIL PROTECTED]

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

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