Assignment Confusion Matrix

Published by Mario Oettler on

Last Updated on 28. April 2023 by Martin Schuster

Task

Suppose we have a test for a disease. There are 800 test persons. 50 of them are sick. The test yields 100 positive results. 40 of the positively tested persons are positive in reality.

Create the confusion matrix and calculate the PPV (precision), NPV, sensitivity, and specificity

Solution
Reality
PositiveNegativeSum
TestPositive4060100
Negative10690700
Sum50750800

PPV: 0.4

NPV: 0.986

Sensitivity: 0.8

Specificity: 0.92

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