A function to get an initial estimate of Y, to be used in calibrating the MCMC. Not for general use
estimateY(X, betahat, omegahat, surv, control)
an estimate of Y, to be used in calibrating the MCMC
the design matrix containing covariate information
an estimate of beta
an estimate of omega
an object of class Surv
a list containg various control parameters for the MCMC and post-processing routines