 output matrix. For a <code>Jointlcmm</code> object, the first posterior
classification and the classification table are derived from the posterior
class-membership probabilities given the vector of repeated measures and the
time-to-event information (that are contained in columns probYT1, probYT2,
etc in pprob output matrix). The second posterior classification is derived
from the posterior class-membership probabilities given only the vector of
repeated measures (that are contained in columns probY1, prob