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# TBSSurvival package for R (http://www.R-project.org)
# Copyright (C) 2012 Adriano Polpo, Cassio de Campos, Debajyoti Sinha
# Jianchang Lin and Stuart Lipsitz.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, 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 License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#######################################################################
## quantile function for the TBS
## public version checks if arguments are valid
## dist is a list, we assume the four functions of the dist are
## given as $d(x,xi) $p(x,xi) $r(x,xi) $q(x,xi) plus a test function to check if
## the list of parameters are in compliance with the functions. If dist is
## a string, then dist.error is called to try to transform it into the necessary
## functions
qtbs <- function(p,lambda=1,xi=1,beta=1,x=NULL,dist=dist.error("norm")) {
if(is.character(dist)) dist=dist.error(dist)
aux <- .test.tbs(lambda,xi,beta,x,type="q",p=p)
return(.qtbs(p,lambda,xi,aux$beta,aux$x,dist))
}
## this private version does not check the arguments, but assumes they are ok
## calling the private version is faster than the public because of that
.qtbs <- function(p,lambda=1,xi=1,beta=1,x=NULL,dist=dist.error("norm")) {
aux2 <- c(x%*%beta)
if (length(aux2) == 1)
out <- c(exp(.g.lambda.inv(.g.lambda(aux2,lambda)+
dist$q(p,xi),lambda)))
else {
out <- matrix(0,length(p),length(aux2))
for (i in 1:length(aux2))
out[,i] <- c(exp(.g.lambda.inv(.g.lambda(aux2[i],lambda)+dist$q(p,xi),lambda)))
}
return(out)
}
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