STATA "collapse" function

["Roberts, J. Kyle" <jkrobert@bcm.tmc.edu>]

Dear All,

I am looking for a function in S-PLUS that works like "collapse" in STATA.  
Specifically, I am trying to create some level-2 and level-3 datasets for use 
in HLM from a single dataset that I analyzed as a 3-level model in S-PLUS.  I 
tried collapse.groupedData, but I'm not getting exactly what I want.
In STATA, the function might look like:

collapse (mean)  meanses size sector pracad disclim himinty, by(id)

Thanks,
Kyle

***************************************
J. Kyle Roberts, Ph.D.
Baylor College of Medicine
Center for Educational Outreach
One Baylor Plaza, MS:  BCM411
Houston, TX   77030-3411
713-798-6672 - 713-798-8201 Fax
jkrobert@bcm.edu
***************************************