Various forms of contact restriction have been adopted in response to the Covid-19 pandemic. Only recently, rapid testing appeared as a new policy instrument. If sufficiently effective, it may serve as a substitute for contact restrictions. Against this background we evaluate the effects of a...

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...

The classical Heckman (1976, 1979) selection correction estimator (heckit) is misspecified and inconsistent if an interaction of the outcome variable and an explanatory variable matters for selection. To address this specification problem, a full information maximum likelihood estimator and a...