I am trying to calculate population attributable fraction. The formula that i am using is
$$ \frac{P_e(RR-1)}{P_e(RR-1) + 1} $$
I am using this website as guide: https://sphweb.bumc.bu.edu/otlt/mph-modules/ep/ep713_association/EP713_Association7.html
I am unable to understand how did they calculate $P_e$. It says that its proportion of exposed subjects in entire population. The entire population here is 100,000 and total exposed subjects are 10,000 (500 with disease and 9500 without disease). If i do $10000/100000$ then the answer is $0.1$. How did the website shows its $0.2$?
