survival parameterization of
a fitted cp model (or survreg object with exponential, weibull,
lognormal, or loglogistic distribution)retrieve EoA parameterization from survival parameterization of
a fitted cp model (or survreg object with exponential, weibull,
lognormal, or loglogistic distribution)
getab(cpmodel)2-vector of pda and pdb
fitted cp model (from est_cp0 or survreg object)