predict.hhsmmspec {hhsmm} | R Documentation |
prediction of state sequence for hhsmm
Description
Predicts the state sequence of a hidden hybrid Markov/semi-Markov model
for a new (test) data of class "hhsmmdata"
with an optional prediction of the
residual useful lifetime (RUL) for a left to right model
Usage
## S3 method for class 'hhsmmspec'
predict(object, newdata, method = "viterbi", M = NA, ...)
Arguments
object |
a hidden hybrid Markov/semi-Markov model |
newdata |
a new (test) data of class |
method |
the prediction method with two options:
|
M |
maximum duration in states |
... |
additional parameters of the function |
Value
a list containing the following items:
-
x
the observation sequence -
s
the predicted state sequence -
N
the vector of sequence lengths -
p
the state probabilities -
RUL
the point predicts of the RUL -
RUL.low
the lower bounds for the prediction intervals of the RUL -
RUL.up
the upper bounds for the prediction intervals of the RUL
Author(s)
Morteza Amini, morteza.amini@ut.ac.ir, Afarin Bayat, aftbayat@gmail.com
References
Guedon, Y. (2005). Hidden hybrid Markov/semi-Markov chains. Computational statistics and Data analysis, 49(3), 663-688.
OConnell, J., & Hojsgaard, S. (2011). Hidden semi Markov models for multiple observation sequences: The mhsmm package for R. Journal of Statistical Software, 39(4), 1-22.
See Also
Examples
J <- 3
initial <- c(1, 0, 0)
semi <- c(FALSE, TRUE, FALSE)
P <- matrix(c(0.8, 0.1, 0.1, 0.5, 0, 0.5, 0.1, 0.2, 0.7), nrow = J,
byrow = TRUE)
par <- list(mu = list(list(7, 8), list(10, 9, 11), list(12, 14)),
sigma = list(list(3.8, 4.9), list(4.3, 4.2, 5.4), list(4.5, 6.1)),
mix.p = list(c(0.3, 0.7), c(0.2, 0.3, 0.5), c(0.5, 0.5)))
sojourn <- list(shape = c(0, 3, 0), scale = c(0, 10, 0), type = "gamma")
model <- hhsmmspec(init = initial, transition = P, parms.emis = par,
dens.emis = dmixmvnorm, sojourn = sojourn, semi = semi)
train <- simulate(model, nsim = c(10, 8, 8, 18), seed = 1234, remission = rmixmvnorm)
test <- simulate(model, nsim = c(5, 3, 3, 8), seed = 1234, remission = rmixmvnorm)
clus = initial_cluster(train, nstate = 3, nmix = c(2, 2, 2), ltr = FALSE,
final.absorb = FALSE, verbose = TRUE)
semi <- c(FALSE, TRUE, FALSE)
initmodel1 = initialize_model(clus = clus, sojourn = "gamma", M = max(train$N), semi = semi)
yhat1 <- predict(initmodel1, test)