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####################################################################
##
## hSDM.ZIP.R
##
####################################################################
##
## Original code by Ghislain Vieilledent, November 2013
## CIRAD UR B&SEF
## ghislain.vieilledent@cirad.fr / ghislainv@gmail.com
##
####################################################################
##
## This software is distributed under the terms of the GNU GENERAL
## PUBLIC LICENSE Version 2, June 1991. See the package LICENSE
## file for more information.
##
## Copyright (C) 2011 Ghislain Vieilledent
##
####################################################################
hSDM.ZIP <- function (# Observations
counts,
suitability, abundance, data,
# Predictions
suitability.pred=NULL,
# Chains
burnin=5000, mcmc=10000, thin=10,
# Starting values
beta.start,
gamma.start,
# Priors
mubeta=0, Vbeta=1.0E6,
mugamma=0, Vgamma=1.0E6,
# Various
seed=1234, verbose=1,
save.p=0)
{
#========
# Basic checks
#========
check.mcmc.parameters(burnin, mcmc, thin)
check.verbose(verbose)
check.save.p(save.p)
#========
# Form response, covariate matrices and model parameters
#========
#= Response
Y <- counts
nobs <- length(Y)
#= Suitability
mf.suit <- model.frame(formula=suitability,data=data)
X <- model.matrix(attr(mf.suit,"terms"),data=mf.suit)
#= Abundance
mf.obs <- model.frame(formula=abundance,data=data)
W <- model.matrix(attr(mf.obs,"terms"),data=mf.obs)
#= Predictions
if (is.null(suitability.pred)) {
X.pred <- X
npred <- nobs
}
if (!is.null(suitability.pred)) {
mf.pred <- model.frame(formula=suitability,data=suitability.pred)
X.pred <- model.matrix(attr(mf.pred,"terms"),data=mf.pred)
npred <- nrow(X.pred)
}
#= Model parameters
np <- ncol(X)
nq <- ncol(W)
ngibbs <- mcmc+burnin
nthin <- thin
nburn <- burnin
nsamp <- mcmc/thin
#==========
# Check data
#==========
check.Y.poisson(Y)
check.X(X,nobs)
check.W(W,nobs)
#========
# Initial starting values for M-H
#========
beta.start <- form.beta.start(beta.start,np)
gamma.start <- form.gamma.start(gamma.start,nq)
#========
# Form and check priors
#========
mubeta <- check.mubeta(mubeta,np)
Vbeta <- check.Vbeta(Vbeta,np)
mugamma <- check.mugamma(mugamma,nq)
Vgamma <- check.Vgamma(Vgamma,nq)
#========
# Parameters to save
#========
beta <- rep(beta.start,nsamp)
gamma <- rep(gamma.start,nsamp)
prob_p_latent <- rep(0,nobs)
prob_q_latent <- rep(0,nobs)
if (save.p==0) {prob_p_pred <- rep(0,npred)}
if (save.p==1) {prob_p_pred <- rep(0,npred*nsamp)}
Deviance <- rep(0,nsamp)
#========
# call C++ code to draw sample
#========
Sample <- .C("hSDM_ZIP",
#= Constants and data
ngibbs=as.integer(ngibbs), nthin=as.integer(nthin), nburn=as.integer(nburn), ## Number of iterations, burning and samples
nobs=as.integer(nobs),
np=as.integer(np),
nq=as.integer(nq),
Y_vect=as.integer(c(Y)),
X_vect=as.double(c(X)),
W_vect=as.double(c(W)),
#= Predictions
npred=as.integer(npred),
X_pred_vect=as.double(c(X.pred)),
#= Starting values for M-H
beta_start=as.double(c(beta.start)),
gamma_start=as.double(c(gamma.start)),
#= Parameters to save
beta.nonconst=as.double(beta), ## Fixed parameters of the regression
gamma.nonconst=as.double(gamma),
#= Defining priors
mubeta=as.double(c(mubeta)), Vbeta=as.double(c(Vbeta)),
mugamma=as.double(c(mugamma)), Vgamma=as.double(c(Vgamma)),
#= Diagnostic
Deviance.nonconst=as.double(Deviance),
prob_p_latent.nonconst=as.double(prob_p_latent), ## Predictive posterior mean
prob_q_latent.nonconst=as.double(prob_q_latent), ## Predictive posterior mean
prob_p_pred.nonconst=as.double(prob_p_pred),
#= Seed
seed=as.integer(seed),
#= Verbose
verbose=as.integer(verbose),
#= Save p
save_p=as.integer(save.p),
PACKAGE="hSDM")
#= Matrix of MCMC samples
Matrix <- matrix(NA,nrow=nsamp,ncol=np+nq+1)
names.fixed <- c(paste("beta.",colnames(X),sep=""),paste("gamma.",colnames(W),sep=""))
colnames(Matrix) <- c(names.fixed,"Deviance")
#= Filling-in the matrix
Matrix[,c(1:np)] <- matrix(Sample[[14]],ncol=np)
Matrix[,c((np+1):(np+nq))] <- matrix(Sample[[15]],ncol=nq)
Matrix[,ncol(Matrix)] <- Sample[[20]]
#= Transform Sample list in an MCMC object
MCMC <- mcmc(Matrix,start=nburn+1,end=ngibbs,thin=nthin)
#= Save pred
if (save.p==0) {prob.p.pred <- Sample[[23]]}
if (save.p==1) {
Matrix.p.pred <- matrix(Sample[[23]],ncol=npred)
colnames(Matrix.p.pred) <- paste("p.",c(1:npred),sep="")
prob.p.pred <- mcmc(Matrix.p.pred,start=nburn+1,end=ngibbs,thin=nthin)
}
#= Output
return (list(mcmc=MCMC,
prob.p.pred=prob.p.pred,
prob.p.latent=Sample[[21]], prob.q.latent=Sample[[22]]))
}
#===================================================================
# END
#===================================================================
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