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genTHMM <- function(n, model.cens, cens.par, beta, covar, rate) {
if (n <= 0) stop("Argument 'n' must be greater than 0", call.=FALSE)
if ( !( model.cens %in% c("uniform", "exponential") ) ) stop("Argument 'model.cens' must be one of 'uniform' or 'exponential'", call.=FALSE)
if (cens.par <= 0) stop("Argument 'cens.par' must be greater than 0", call.=FALSE)
if (length(beta) != 3) stop("Argument 'beta' length must be a vector with length 3", call.=FALSE)
if (covar <= 0) stop("Argument 'covar' must be greater than 0", call.=FALSE)
if (length(rate) != 3) stop("Argument 'rate' must be a vector with length 3", call.=FALSE)
if (model.cens == "uniform") {
rfunc <- runifcens
} else if (model.cens == "exponential") rfunc <- rexpcens
mat <- matrix(ncol=4, nrow=1)
for (k in 1:n) {
z1 <- runif(1, 0, covar)
c <- rfunc(1, cens.par)
rate12 <- rate[1]*exp(beta[1]*z1)
rate13 <- rate[2]*exp(beta[2]*z1)
rate23 <- rate[3]*exp(beta[3]*z1)
t12 <- rexp(1, rate12)
t13 <- rexp(1, rate13)
t23 <- rexp(1, rate23)
if (c < min(t12, t13) ) {
aux1<-c(k,0,1,z1)
mat<-rbind(mat,aux1)
aux2<-c(k,c,1,z1)
mat<-rbind(mat,aux2)
} else {
if (t13 < t12) {
aux1 <- c(k, 0, 1, z1)
mat <- rbind(mat, aux1)
aux2 <- c(k, t13, 3, z1)
mat <- rbind(mat, aux2)
} else {
aux1 <- c(k, 0, 1, z1)
mat <- rbind(mat, aux1)
aux2 <- c(k, t12, 2, z1)
mat <- rbind(mat, aux2)
if (c < t12+t23) {
aux1 <- c(k, c, 2, z1)
mat <- rbind(mat, aux1)
} else {
aux1 <- c(k ,t12+t23, 3, z1)
mat <- rbind(mat, aux1)
}
}
}
}
data <- data.frame(mat, row.names=NULL)
names(data) <- c("PTNUM", "time", "state", "covariate")
data <- data[-1,]
row.names(data) <- as.integer( 1:nrow(data) )
class(data) <- c(class(data), "THMM")
return(data)
}
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