pars.fmsm(x, trans, newdata=NULL, tvar="trans")flexsurvreg. See
msfit.flexsurvreg
for the required form of the model and the data. x can also be a list of flexsurvreg models, with one component for each
permitted transition in the multi-state model, as illustrated in
msfit.flexsurvreg.
msfit.flexsurvreg.msfit.flexsurvreg.x is a list of models.