R help - Sep 2000 - Repeated Measures

Hi R Gurus, 

I am more or less a beginner with R.  I have searched your FAQ, manuals, and
the archives of this list for an answer to this question, unsuccessfully.
I commonly do analysis of chemical characteristics of soils, by depth
intervals (e.g. 0-100 mm, 100-200, 200-300, etc), comparing two soil
profiles that 
have received some treatment (effluent).  In Genstat I can handle this
problem using one of several repeated measures approaches that allow me to
determine if the 
profiles on a whole are sig dif, to determine if one depth interval is
significantly different from another (within the same profile), and to
determine if significant leaching
has occurred from the active root zone.  In genstat the procedures are
Arepmeas, and Antedependence.

Is there a comparable capability in R?

Thanks, 

Matt Redding
Soil Scientist
Intensive Livestock Environmental Management-Research
Department of Primary Industries, Queensland
Australia.  ph 61 7 46 881372
	fax 61 7 46 881192
	reddinm at dpi.qld.gov.au
            http://www.dpi.qld.gov.au/ilems



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I am unfamiliar with genstat, but in our notes for psychology we
cover repeated measures in R.  In the current version, see
section 4.2.3, and more generally, 6.7.  It sounds like your
predictor variables should be defined as factors, but I'm not
sure (since they may be ordered).  Because our examples use
mostly binary variables, we don't bother with that.  

There is also discussion of repeated measures in Venables and
Ripley's book and in Chambers and Hastie's book.

See http://www.psych.upenn.edu/~baron/rpsych.htm

Jon
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