Here's the problem I'm trying to solve:
"Calculate the probability of having the disease for a person with a positive test result."
The information I have is:
True positive percent = 90%
False positive percent = 1%
Percent of disease in general population = 0.01%
I'm getting confused because I'm used to working with counts and I'm not sure I can use the same formulas when I only have ratios. Hints are welcome!