Call:
PF_EM(formula = Surv(time, status == 2) ~ ph.ecog + age, data = .lung, 
    by = 50, max_T = 800, id = 1:nrow(.lung), Q_0 = diag(1, 3), 
    Q = diag(0.1, 3), control = list(N_fw_n_bw = 200, N_first = 200, 
        N_smooth = 200, n_max = 5, n_threads = 1))

Model estimated in 5 iterations of the EM algorithm. The log-likelihood in the last iteration is -497.7894.
