A parameter estimation routine for the vitality-based survival model

An algorithm is described which determines model parameters for the vitality-based survival model [Ecological Monographs 70 (2000) 445]. The algorithm uses an MLE estimator on interval-based survival data and returns the vitality model parameters: the rate of vitality loss, the variability in the rate of vitality loss and the rate of accidental mortality. Standard errors of the parameter estimates and a Goodness-of-fit measure (via a Pearson’s C test) are also returned. Issues of right censored data and study start time are addressed.