Additional file 3 of Mind your prevalence!

Additional file 3. A word document that describes in detail the derivation of the performance metrics accuracy, Matthews’ correlation coefficient, positive predictivity, negative predictivity and Cohen’s kappa coefficient as functions of sensitivity, specificity and prevalence as well as their balanced version. Each plot and their corresponding function show the relationship that exists between the performance metrics and the prevalence at given values of sensitivity and specificity.

补充材料3。一份Word文档，详细推导了以敏感度（sensitivity）、特异度（specificity）、患病率（prevalence）为变量的多项性能指标：准确率（accuracy）、马修斯相关系数（Matthews’ correlation coefficient）、阳性预测值（positive predictivity）、阴性预测值（negative predictivity）以及科恩kappa系数（Cohen’s kappa coefficient），及其平衡版本。各图表及其对应的函数均展示了在给定敏感度与特异度取值的前提下，性能指标与患病率之间的关联关系。