R help - Jun 2007 - Question using stepAIC

Hi - I use stepAIC to automatically select the model. The stepAIC was applied on
polr as follow:objPolr <- polr(formula=myformula, data=dat,
method=METHOD);objPolr.step <- stepAIC(objPolr, trace=T);Then R complaints
that it doesn't know about 'dat' when it executes the second line.
Below is the exact error that I got when executing the stepAIC line above:Error
in eval(expr, envir, enclos) : object "dat" not foundWould you please
provide some guide to circumvent this? Thank you.- adschai

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adschai at optonline.net wrote:
> Hi - I use stepAIC to automatically select the model. The stepAIC was
applied on polr as follow:objPolr <- polr(formula=myformula, data=dat,
method=METHOD);objPolr.step <- stepAIC(objPolr, trace=T);Then R complaints
that it doesn't know about 'dat' when it executes the second line.
Below is the exact error that I got when executing the stepAIC line above:Error
in eval(expr, envir, enclos) : object "dat" not foundWould you please
provide some guide to circumvent this? Thank you.- adschai

Please read the psoting guide mentioned below each message of this list 
and learn to add appropriate line breaks to your messages or fix your 
Enter key.

What is dat? Is it a data.frame in the Workspace? What R version, what 
version of MASS, which OS?

Uwe Ligges


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