Empirical transition matrix of multi-state models: the etm package

Multi-state models provide a relevant framework for modelling complex event histo-ries. 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 etm that computes and displays the transition prob-abilities. etm 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.