Data summary:
                                                    \(H(t_i) = \int_{0}^{t_i} \exp\left( \beta_0(\tau))\exp( \sum_{j = 1}^{p} \varphi_j x_j \sum_{k = 1}^{m}\omega_{jk}\psi_k(\tau) \right) d\tau\)
  • \(\ell(\theta) = \sum_{i = 1}^{n} \log(h(t_i)^{\delta_i}) + \log(S(t_i)) = \sum_{i = 1}^{n} \log(h(t_i)^{\delta_i}) - H(t_i)\)