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. 2020 Aug 31;18:328. doi: 10.1186/s12967-020-02505-7

Fig. 3.

Fig. 3

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