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## Copyright (C) 2023 Rodney A. Sparapani
## This file is part of nftbart.
## concordance.R
## nftbart 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 2 of the License, or
## (at your option) any later version.
## nftbart 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/>.
## Author contact information
## Rodney A. Sparapani: rsparapa@mcw.edu
concordance=function(draws, times, delta=NULL)
{
N=ncol(draws)
if(N!=length(times))
stop('draw columns and times must be the same length')
if(length(delta)==0) delta=rep(1, N)
else if(N!=length(delta))
stop('draw columns and delta must be the same length')
C=double((N*(N-1)/2))
##C=matrix(nrow=N, ncol=N)
k=1
for(i in 1:(N-1))
for(j in (i+1):N) {
if((times[i]==times[j] && delta[i]>delta[j]) ||
(times[i]<times[j] && delta[i]>0))
C[k]=mean(draws[ , i]<draws[ , j])
else if((times[i]==times[j] && delta[i]<delta[j]) ||
(times[i]>times[j] && delta[j]>0))
C[k]=mean(draws[ , i]>draws[ , j])
else C[k]=NA
k=k+1
}
return(mean(C, na.rm=TRUE))
}
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