Implications of Heterogeneous Sir Models for Analyses of Covid-19
34 Pages Posted: 15 Jun 2020 Last revised: 17 Apr 2023
Date Written: June 2020
Abstract
This paper provides a quick survey of results on the classic SIR model and variants allowing for heterogeneity in contact rates. It notes that calibrating the classic model to data generated by a heterogeneous model can lead to forecasts that are biased in several ways and to understatement of the forecast uncertainty. Among the biases are that we may underestimate how quickly herd immunity might be reached, underestimate differences across regions, and have biased estimates of the impact of endogenous and policy-driven social distancing.
Suggested Citation: Suggested Citation
Ellison, Glenn David, Implications of Heterogeneous Sir Models for Analyses of Covid-19 (June 2020). NBER Working Paper No. w27373, Available at SSRN: https://ssrn.com/abstract=3626873
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