How to Remove the Testing Bias in Cov-2 Statistics

18 Pages Posted: 20 Oct 2020

See all articles by Klaus Wälde

Klaus Wälde

Johannes Gutenberg University Mainz - Gutenberg School of Economics and Management

Abstract

Background: Public health measures and private behaviour are based on reported numbers of SARS-CoV-2 infections. Some argue that testing influences the confirmed number of infections.Objectives/Methods: Do time series on reported infections and the number of tests allow one to draw conclusions about actual infection numbers? A SIR model is presented where the true numbers of susceptible, infectious and removed individuals are unobserved. Testing is also modelled.Results: Official confirmed infection numbers are likely to be biased and cannot be compared over time. The bias occurs because of different reasons for testing (e.g. by symptoms, representative or testing travellers). The paper illustrates the bias and works out the effect of the number of tests on the number of reported cases. The paper also shows that the positive rate (the ratio of positive tests to the total number of tests) is uninformative in the presence of non-representative testing.Conclusions: A severity index for epidemics is proposed that is comparable over time. This index is based on Covid-19 cases and can be obtained if the reason for testing is known.

Keywords: SIR model, (correcting the) bias, reported number of CoV-2 infections, number of tests, COVID-19, unbiased epidemiological severity index

JEL Classification: I18, C23

Suggested Citation

Wälde, Klaus, How to Remove the Testing Bias in Cov-2 Statistics. IZA Discussion Paper No. 13785, Available at SSRN: https://ssrn.com/abstract=3713626

Klaus Wälde (Contact Author)

Johannes Gutenberg University Mainz - Gutenberg School of Economics and Management ( email )

Mainz
Germany

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