of the event for the ith individual in the interval

One needs to specify ho(·) and /3(·) in order to determine an extended Gamma process. If one can offer an a priori guess for the hazard function as well as a function which guesses the amount of variation one might anticipate in the hazard at each t then Dykstra and Laud indicate how h0 and j3 can be obtained from these two functions.