Positive Predictive Value Calculator

Formula

The formula to calculate the Positive Predictive Value (PPV) is:

\[ PPV = \frac{TP}{TP + FP} \times 100 \]

Where:

\(PPV\) is the Positive Predictive Value (%)
\(TP\) is the number of true positives
\(FP\) is the number of false positives

Positive Predictive Value Definition

Positive Predictive Value (PPV) is a measure of the performance of a diagnostic test or screening method. It represents the probability that a person who has a positive test result actually has the disease. A higher PPV indicates that the test has a lower rate of false positives and is more reliable when it gives a positive result.

Example Calculation

Let's assume the following values:

True Positives (TP) = 80
False Positives (FP) = 20

Using the formula to calculate the Positive Predictive Value (PPV):

\[ PPV = \frac{80}{80 + 20} \times 100 = 80 \]

The Positive Predictive Value (PPV) is 80%.