The function controls that a time-dependent posterior frailty estimate is computed for each centre
check.post_frailty_centre(post_frailty_est, centre_codes)An error if any condition is not satisfied.
An S3 class object containing the posterior frailty estimates \(\hat{\alpha}_j, \hat{\epsilon}_{jk}, \hat{Z}_{jk}, \forall j,k\)
Numerical vector of length equal to the number of distinct centres/clusters in the study