This function implements a family for
fitting multistate models using mboost.
multistate(Ri, Ci)a list giving the individual (i.e., spell specific) risksets.
a list giving the indexes of risksets an individual spell is a part of (see page 213 in the book Generalized Additive Models by T.J. Hastie and R.J. Tibshirani for a description).
Functions to be used inside gamboost.
This function implements a family for multistate models and
will be used inside the gamboost or glmboost function.