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. 2011 Aug 4;54(9):1815. doi: 10.1007/s11425-011-4224-7

A nonparametric estimation of the infection curve

HuaZhen Lin 1,✉, Paul S F Yip 2, Richard M Huggins 3
PMCID: PMC7089265  PMID: 32214992

Abstract

Predicting the future course of an epidemic depends on being able to estimate the current numbers of infected individuals. However, while back-projection techniques allow reliable estimation of the numbers of infected individuals in the more distant past, they are less reliable in the recent past. We propose two new nonparametric methods to estimate the unobserved numbers of infected individuals in the recent past in an epidemic. The proposed methods are noniterative, easily computed and asymptotically normal with simple variance formulas. Simulations show that the proposed methods are much more robust and accurate than the existing back projection method, especially for the recent past, which is our primary interest. We apply the proposed methods to the 2003 Severe Acute Respiratory Syndorme (SARS) epidemic in Hong Kong.

Keywords: epidemic, back-projection, nonparametric method, infection curve

Contributor Information

HuaZhen Lin, Email: linhz@swufe.edu.cn.

Paul S. F. Yip, Email: sfpyip@hku.hk

Richard M. Huggins, Email: huggins@ms.unimelb.edu.au

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