[R] How to do a "proc summary" in R?

[Frank E Harrell Jr]

Emilie Berthiaume wrote:
> Hi,
> 
> I'm a SAS user trying to convert myself to R but I still have problems with some pretty simple commands.
> 
> First I wanted to add up a number of red-tailed hawks seen per day (julian day) per year.  So I tried:
> 
> RTyrday <- tapply(RThr,list(year,julian),sum)
> 
> And then I tried the following regression:
> 
> mod1 <-  glm(RTyrday~julian+year, family=gaussian (link=identity),data=RT)
> 
> Wich didn't work since my vector RTyrday and julian don't have the same length.  My question is: How can I create a new data sheet with the output of my function "tapply" ?  Something I could have done in SAS by giving an "output out" to my "proc summary"
> 
> Thank you,
> 
> Emilie

One of many ways is at 
http://biostat.mc.vanderbilt.edu/SasByMeansExample (especially for SAS 
users).  The example uses the R Hmisc package.

Frank

> 
> 
> 
> Emilie Berthiaume
> Graduate Student
> Biology Department
> Sherbooke University
> Sherbrooke, Québec
> CANADA
> 
> emilie.berthiaume at USherbrooke.ca
> 	[[alternative HTML version deleted]]
> 
> 
> 
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-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University