statetable.msm {msm} | R Documentation |
Calculates a frequency table counting the number of times each pair of states were observed in successive observation times. This can be a useful way of summarising multi-state data.
statetable.msm(state, subject, data=NULL)
state |
Observed states, assumed to be ordered by time within each subject. |
subject |
Subject identification numbers corresponding to
|
data |
An optional data frame in which the variables represented
by |
If the data are intermittently observed (panel data) this table should
not be used to decide what transitions should be allowed in the
Q
matrix, which works in continuous time. This function counts
the transitions between states over a time interval, not in real time.
There can be observed transitions between state r
and s
over an interval even if q_{rs}=0
, because the process may have
passed through one or more intermediate states in the middle of the
interval.
A frequency table with starting states as rows and finishing states as columns.
C. H. Jackson chris.jackson@mrc-bsu.cam.ac.uk
## Heart transplant data
data(cav)
## 148 deaths from state 1, 48 from state 2 and 55 from state 3.
statetable.msm(state, PTNUM, data=cav)