Im a surgeon who's trying to compare two diagnostic tests that are used to diagnose appendicitis. Two diagnostic tests were applied on 150 patients and the results were compared to a gold standard. I understand that the sensitivities and specificities can be compared by using a McNemars chi square test. But what about the positive and negative predictive values... how do you compare these? Any help would be appreciated!
eg.
![enter image description here](https://i.stack.imgur.com/2ZrYE.jpg)