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lindawangg / COVID-Net

COVID-Net Open Source Initiative
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Sensitivity / Specificity #91

Closed jomollin closed 3 years ago

jomollin commented 4 years ago

Hi Linda,

is your named Positive Predictive Value (%) identical to Specificity in your different models?

Best Joachim

haydengunraj commented 3 years ago

Hi Joachim,

Specificity and PPV are different measures. Specificity measures the proportion of ground-truth negatives which were correctly predicted negative (i.e., sens = TN/(FP + TN)), whereas PPV measures the proportion of positive predictions which are true positives (i.e., PPV = TP/(TP + FP)).