Abstract
Consider a system evolving according to an absorbing discrete-time Markov chain with known transition matrix. The state of the system is observed at two points in time, separated by an unknown number of generations. We are interested in calculating the expected elapsed time and its variance. We provide a novel, exact solution, which is computable from the fundamental matrix of a related absorbing Markov chain. This solution may be useful in population genetics for computing the expected age of a segregating allele without requiring diffusion approximation.
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