hsmm.sim: Simulate a Gaussian hidden semi-Markov series with / without...

In rarhsmm: Regularized Autoregressive Hidden Semi Markov Model

Description

Simulate a Gaussian hidden semi-Markov series with / without autoregressive structures

Usage

hsmm.sim(ns, mod)

Arguments

ns

length of the simulated series

mod

list consisting of at least the following items: mod$m = number of states, mod$delta = vector of prior probabilities, mod$gamma = matrix of state transition probabilies. mod$mu = list of means, mod$sigma = list of covariance matrices. mod$d = list of state duration probabilities. For autoregressive hidden markov models, we also need the additional items: mod$auto = list of autocorrelation matrices. mod$arp = order of autoregressive.

Value

a list containing simulated series and states

References

Rabiner, Lawrence R. "A tutorial on hidden Markov models and selected applications in speech recognition." Proceedings of the IEEE 77.2 (1989): 257-286.

Examples

set.seed(351)
#Gaussian HSMM 3 hidden states (no autoregressive structure)
m <- 3
mu <- list(c(3),c(-2),c(0))
sigma <- list(as.matrix(1), as.matrix(0.8),as.matrix(0.3))
delta <- c(0.3,0.3,0.4)
gamma <- matrix(c(0,0.5,0.5,0.5,0,0.5,0.5,0.5,0),3,3,byrow=TRUE)
d <- list(c(0.4,0.3,0.2,0.1), c(0.5,0.25,0.25), c(0.7,0.3))
mod1 <- list(m=m,mu=mu,sigma=sigma,delta=delta,gamma=gamma,d=d)
sim1 <- hsmm.sim(500,mod1)
y1 <- sim1$series
fit1 <- em.semi(y=y1, mod=mod1)

## Not run: 
#AR(2) Gaussian HSMM with 3 hidden states
m <- 2
mu <- list(c(3,4,5),c(-2,-3,-4))
sigma <- list(diag(1.3,3), 
            matrix(c(1,-0.3,0.2,-0.3,1.5,0.3,0.2,0.3,2),3,3,byrow=TRUE))
delta <- c(0.5,0.5)
gamma <- matrix(c(0,1,1,0),2,2,byrow=TRUE)
d <- list(c(0.4,0.2,0.1,0.1,0.1,0.1),c(0.5,0.3,0.2))
auto <- list(matrix(c(0.3,0.2,0.1,0.4,0.3,0.2,
                     -0.3,-0.2,-0.1,0.3,0.2,0.1,
                      0,0,0,0,0,0),3,6,byrow=TRUE),
            matrix(c(0.2,0,0,0.4,0,0,
                      0,0.2,0,0,0.4,0,
                     0,0,0.2,0,0,0.4),3,6,byrow=TRUE))
mod2 <- list(m=m,mu=mu,sigma=sigma,delta=delta,gamma=gamma,
            auto=auto,arp=2,d=d)
sim2 <- hsmm.sim(2000,mod2)
y2 <- sim2$series
fit2 <- em.semi(y=y2, mod=mod2, arp=2)

## End(Not run)

Example output

iteration  1 ; loglik =  -1025.779 
iteration  2 ; loglik =  -1019.649 
iteration  3 ; loglik =  -1019.411 
iteration  4 ; loglik =  -1019.362 
iteration  5 ; loglik =  -1019.344 
iteration  6 ; loglik =  -1019.334 
iteration  7 ; loglik =  -1019.328 
iteration  8 ; loglik =  -1019.324 
iteration  9 ; loglik =  -1019.321 
iteration  10 ; loglik =  -1019.319 
iteration  11 ; loglik =  -1019.317 
iteration  12 ; loglik =  -1019.316 
iteration  13 ; loglik =  -1019.315 
iteration  14 ; loglik =  -1019.314 
iteration  1 ; loglik =  -35069.29 
iteration  2 ; loglik =  -27317.43 
iteration  3 ; loglik =  -25924.26 
iteration  4 ; loglik =  -25238.04 
iteration  5 ; loglik =  -24829.38 
iteration  6 ; loglik =  -24445.05 
iteration  7 ; loglik =  -23891.5 
iteration  8 ; loglik =  -23539.6 
iteration  9 ; loglik =  -23468.22 

rarhsmm documentation built on May 2, 2019, 9:33 a.m.