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Fig. 1 | Diagnostic and Prognostic Research

Fig. 1

From: The calibrated model-based concordance improved assessment of discriminative ability in patient clusters of limited sample size

Fig. 1

Performance measures at internal validation across 19 centers of the CRASH trial. Closed dots represent fixed effect intercept estimates; fixed effect slope estimates; and c-indexes in the first, second, and third panel, respectively. Open dots represent random effects intercept estimates, random effects slope estimates, and calibrated model-based concordance estimates in the first, second, and third panel, respectively. Gray vertical lines represent effect estimates of intercept (0) and slope (1) in the original regression model, together with the expected pooled concordance (0.85). Black vertical lines represent fixed effect estimates of intercept (0.24) and slope (0.96) in a multilevel regression model, together with the expected pooled concordance (0.84). The number of patients in each center is indicated on the right y-axis

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