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muproposal<-function(y, x, z, betas.ini,gammas.ini,bpri,Bpri,model,m,ni) {
if (model=="NB1"){
Etas_1 = x%*%betas.ini
Etas_2 = z%*%gammas.ini
Mu = exp(Etas_1)
Alpha = exp(Etas_2)
Ym_1 = Etas_1 + y/Mu-1 #Var de trabajo
Q1=as.vector((Mu+Alpha)/Alpha*1/Mu)
SIGMA1=diag(Q1)
} else if (model=="NB2") {
Etas_1 = x%*%betas.ini
Etas_2 = z%*%gammas.ini
Mu = exp(Etas_1)
sigma2 = exp(Etas_2)
Ym_1 = Etas_1 + y/Mu-1 #Var de trabajo
Q1=as.vector(sigma2/Mu^2)
SIGMA1=diag(Q1)
} else {
Etas_1 = x%*%betas.ini
Etas_2 = z%*%gammas.ini
Mu=inv.logit(Etas_1)
phi=exp(Etas_2)
if (is.null(m)){
m=length(y)
}
if (is.null(ni)){
nro <- length(y)
ni <- rep(m,nro)
}
Ym_1 = Etas_1 + ((y/ni)-Mu)/(Mu*(1-Mu)) #Var de trabajo
Q1=as.vector((ni*Mu*(1-Mu))^(-1)*(phi+ni)/(phi+1))
SIGMA1=diag(Q1)
}
Bpos <- qr.solve(qr.solve(Bpri,tol = 1e-100)+ t(x)%*%qr.solve(SIGMA1,tol = 1e-100)%*%x,tol = 1e-100)
Bpos <- as.matrix(forceSymmetric(as.matrix(Bpos)))
bpos <- Bpos%*%(qr.solve(Bpri,tol = 1e-100)%*%bpri + t(x)%*%qr.solve(SIGMA1,tol = 1e-100)%*%Ym_1)
betas.pro <- rmvnorm(1,bpos,Bpos)
betas.pro
}
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