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...looking in the wrong places. Any ideas on how to accomplish what I am trying to do or advice on where to find the info would be greatly appreciated. Cheers, Neil ================================================= Neil Hepburn, PhD Candidate Department of Economics University of Alberta email nhepburn at ualberta.ca URL http://www.ualberta.ca/~nhepburn

...e looping variable in a name within the loop structure? Cheers, Neil Hepburn =========================================== Neil Hepburn, Economics Instructor Social Sciences Department, The University of Alberta Augustana Campus 4901 - 46 Avenue Camrose, Alberta T4V 2R3 Phone (780) 697-1588 email nhepburn at augustana.ca

...hat can do a quantile regression with instrumental variables. Cheers, Neil ============================================= Neil Hepburn, Economics Instructor Department of Social Sciences, Augustana Faculty University of Alberta 4901-46 Avenue Camrose, Alberta T4V 2R3 Phone (780) 679-1588 email nhepburn at ualberta.ca No trees were harmed in creating this message. (However, millions of electrons were terribly disturbed.)

Full_Name: Neil Hepburn Version: 2.81 and 2.90 OS: OS-X 10.5.6 Submission from: (NULL) (142.244.28.93) When I create graphs using Rcmdr and then close the quartz display, R blows up and tells me of a segmentation fault. It then gives me *** caught segfault *** address 0xc0000023, cause 'memory not mapped' Possible actions: 1: abort (with core dump, if enabled) 2: normal R exit 3: exit

I have a data set that has student test scores along with several categorical variables. I would like to generate a set of summary stats (mean, variance, n) for the data grouped by school authority and by exam topic. I have tried the by() function but that seems to only be able to handle one level of grouping. In particular what I would like is something like the following Board Subject Mean