Empirical Transition Matrix of Multi-State Models: The<b>etm</b>Package

Multi-State models provide a relevant framework for modelling complex event histories. Quantities of interest are the transition probabilities that can be estimated by the empirical transition matrix, that is also referred to as the Aalen-Johansen estimator. In this paper, we present the R package <b>etm</b> that computes and displays the transition probabilities. <b>etm</b> also features a Greenwood-type estimator of the covariance matrix. The use of the package is illustrated through a prominent example in bone marrow transplant for leukaemia patients.