Fig. 2From: Predictive accuracy of a hierarchical logistic model of cumulative SARS-CoV-2 case growth until May 2020Calibration plots at different forecast horizons. Points refer to regions. The solid black line indicates no prediction error, the blue area indicates a prediction error by a factor of two or less, and the green area indicates a prediction error by a factor of ten or less. Both axes are log-transformedBack to article page