zubin wrote:
> Hello, a beginner R user - boy i wish there was a book on just data
> manipulations for SAS users learning R (equivalent to the SAS DATA
> STEP).. Okay, my question:
>
> I have a panel data set, hotel data occupancy by month for 12 months,
> 1000 hotels. I have a field labeled 'year' and want to consolidate the
> monthly records using an average into 1000 occupancy numbers - just a
> simple average of the 12 months by hotel. In SQL this operation is
> pretty easy, a group by query (group by hotel where year = 2005, avg
> occupancy) - how is this done in R? (in R language not SQL). Thx!
>
> -zubin
>
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This is in the most basic R documentation. Please read it.
--
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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