A unified approach to variability in compartmental models

SUMMARY Variability in compartmental models is shown to be related to interparticle correlations. This permits a unified study of a wide variety of models. In the single-compartment case explicit expressions are given for this interparticle correlation, and hence for the variability of the model, while in the multicompartment setting increased variability of many models is shown to be a consequence of exchangeability and de Finetti's theorem.

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