A data.frame containing a single row for each transition per
subject in the data. For a model with m possible transitions, and n subjects
newdata must have m*n rows. It must contain the following named columns:
id :Unique identifier of the subject, can be numeric or character;
from :State from which the transition takes place;
to :State to which the transition takes place;
trans :Transition number in the 'transMat' trans this transition relates to;
"variables" :The variables and their values for the subject
identified by "id" for the transition this entry relates to. Names must
match the names of the variables in coxph object .
Note that newdata must contain a column containing the variable which was
used to determine the stratum of a transition in object .
Usually the stratum is determined from one of the required columns. The
"variables" columns can usually be obtained using expand.covs .
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