A simple time-delay model of laboratory insect populations which postulates a ‘humped’ relationship between future adult recruitment and current adult population gives good quantitative agreement with Nicholson's classic blowfly data and explains the appearance of narrow ‘discrete’ generations in cycling populations

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August 9, 1988 We present two new general methods for incorporating like-with-like preference into onesex mixing models in epidemiology. The first is a generalization of the Sattenspiel mixing equation, while the second comprises a transformation of a general preference function for partners of similar sexual activity levels. Both methods satisfy the constraints implicit in a mixing model. We then illustrate how the transformation preference method behaves and compare it with the standard proportionate mixing model.

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