# NOT RUN {
data( hosp )
# augmenting the data
hosp_augmented = augment( data = hosp, data_key = subj, n_events = adm_number,
pattern = label_3, t_start = dateIN, t_end = dateOUT,
t_cens = dateCENS )
# let's define the initial transition matrix for our model
Qmat = matrix( data = 0, nrow = 3, ncol = 3, byrow = TRUE )
Qmat[ 1, 1:3 ] = 1
Qmat[ 2, 1:3 ] = 1
colnames( Qmat ) = c( 'IN', 'OUT', 'DEAD' )
rownames( Qmat ) = c( 'IN', 'OUT', 'DEAD' )
# attaching the msm package and running the model using
# gender and age as covariates
library( msm )
msm_model = msm( status_num ~ augmented_int, subject = subj,
data = hosp_augmented, covariates = ~ gender + age,
exacttimes = TRUE, gen.inits = TRUE, qmatrix = Qmat,
method = 'BFGS', control = list( fnscale = 6e+05, trace = 0,
REPORT = 1, maxit = 10000 ) )
# defining the times at which compute the prevalences
t_min = min( hosp_augmented$augmented_int )
t_max = max( hosp_augmented$augmented_int )
steps = 100L
# computing prevalences
prev = prevalence.msm( msm_model, covariates = 'mean', ci = 'normal',
times = seq( t_min, t_max, steps ) )
# and plotting them using prevplot()
gof = prevplot( x = msm_model, prev.obj = prev, ci = TRUE, M = TRUE )
# }
# NOT RUN {
# }
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