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Published online by Cambridge University Press: 14 July 2016
The health of an individual during his lifetime may be considered as a stochastic process over time. He is usually born free of disease; at some time x after his birth, he becomes the victim of a mortal disease or accident, and dies at time y ≧ x. Comparative studies of chronic diseases try to evaluate the relative forces of diseases in a population, and to estimate the survival time y − x. One type of study is of the “time-oriented” type: a group of individuals is followed by a periodic survey over several years. Several papers on these problems, and comprehensive bibliographies, are contained in the volume [3].