[R] by-group processing

[David Freedman]

sorry about the mistake - the -data$Type doesn't work: the '-' sign isn't
valid for factors.  I *thought* I had checked this before submitting a
response !


HufferD wrote:
> 
> On Thursday, May 07, 2009 7:45 PM, David Freedman wrote:
> 
>  > ...how about:
>  >   d=data[order(data$ID,-data$Type),]
>  >   d[!duplicated(d$ID),]
> 
> Does the "-data$Type" argument to the order function work?
> 
> --
>  David
>  
>  -----------------------------------------------------
>  David Huffer, Ph.D.               Senior Statistician
>  CSOSA/Washington, DC           david.huffer at csosa.gov
> 
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> 
> 

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