From Setzer.Woodrow@epamail.epa.gov  Thu Jul 13 17:39:40 2000
From: Setzer.Woodrow@epamail.epa.gov (Setzer.Woodrow@epamail.epa.gov)
Date: Thu, 13 Jul 2000 18:39:40 +0200 (MET DST)
Subject: [Rd] documentation for contrasts and contrasts<- (PR#607)
Message-ID: <200007131639.SAA11242@pubhealth.ku.dk>



The documentation (in ver 1.1) for contrasts and contrasts<- does not list all
the arguments for those functions.  In addition to x, the factor whose contrasts
are being extracted or set, contrasts() has the argument 'contrasts=TRUE', and
contrasts<-() has the argument 'how.many'.

It was this latter that had me flummoxed, because I wanted to reparametrize a
model by specifying a full-rank contrast matrix (fitting without an intercept).

R. Woodrow Setzer, Jr.                                                    Phone:
(919) 541-0128
Biostatistics and
Fax:  (919) 541-4002
Research Support Staff
NHEERL MD-55; US EPA; RTP, NC 27711



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[Rd] documentation for contrasts and contrasts<- (PR#607)
Setzer.Woodrow@epamail.epa.gov