Fig. 3
From: ANDC: an early warning score to predict mortality risk for patients with Coronavirus Disease 2019
Calibration plot comparing predicted and actual death probability of patients with COVID-19. These two figures show actual against predicted death probability of patients with COVID-19. a represents the internal validation. b Represents the external validation. Dotted curve represents the apparent curve without bootstrapping correction. The solid curve represents the 1000-times repeated bootstrapping-correction curve. The dashed curve represents the ideal fit. COVID-19, coronavirus disease 2019