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We consider the question of whether Average Precision, as a measure of retrieval effectiveness, can be regarded as deriving from a model of user searching behaviour. It turns out that indeed it can be so regarded, under a very simple stochastic model of user behaviour.doi:10.1145/1390334.1390453 dblp:conf/sigir/Robertson08 fatcat:azfo5c4hwbdzflg4td22wp6pdu