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#
# rmutil : A Library of Special Functions for Repeated Measurements
# Copyright (C) 2001 J.K. Lindsey
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public Licence as published by
# the Free Software Foundation; either version 2 of the Licence, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public Licence for more details.
#
# You should have received a copy of the GNU General Public Licence
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# SYNOPSIS
#
# contr.mean(n, contrasts=TRUE)
#
# DESCRIPTION
#
# A function to provide correct constraints about the mean
# (correcting contr.sum)
contr.mean <- function(n, contrasts=TRUE){
if(length(n) <= 1){
if(is.numeric(n)&&length(n)==1&&n>1)levels <- 1:n
else stop("Not enough degrees of freedom to define contrasts")}
else levels <- n
lenglev <- length(levels)
if(contrasts){
cont <- array(0,c(lenglev,lenglev-1),
list(levels,levels[1:(lenglev-1)]))
cont[col(cont)==row(cont)] <- 1
cont[lenglev,] <- -1}
else {
cont <- array(0,c(lenglev,lenglev),list(levels,levels))
cont[col(cont) == row(cont)] <- 1}
cont}
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