Bitte verwenden Sie diesen Link, um diese Publikation zu zitieren, oder auf sie als Internetquelle zu verweisen: https://hdl.handle.net/10419/227312 
Autor:innen: 
Erscheinungsjahr: 
2020
Schriftenreihe/Nr.: 
IZA Discussion Papers No. 13785
Verlag: 
Institute of Labor Economics (IZA), Bonn
Zusammenfassung: 
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.
Schlagwörter: 
SIR model
(correcting the) bias
reported number of CoV-2 infections
number of tests
COVID-19
unbiased epidemiological severity index
JEL: 
I18
C23
Dokumentart: 
Working Paper

Datei(en):
Datei
Größe
376.8 kB





Publikationen in EconStor sind urheberrechtlich geschützt.