The formula to calculate the percent positive agreement (PPA) is:
\[ PPA = \left( \frac{PA}{PA + PD} \right) \times 100 \]
Where:
Let's say there are 80 positive agreements and 20 positive disagreements. Using the formula:
\[ PPA = \left( \frac{80}{80 + 20} \right) \times 100 \]
We get:
\[ PPA = 80 \]
So, the percent positive agreement (\( PPA \)) is 80%.