Features the marginal parametric and semi-parametric proportional hazards mixture cure models for analyzing clustered survival data with a possible cure fraction. A reference is Yi Niu and Yingwei Peng (2014) &lt;<a href="https://doi.org/10.1016%2Fj.jmva.2013.09.003" target="_top">doi:10.1016/j.jmva.2013.09.003</a>&gt;.