Why are some MPS scores showing as N/A?

Make sure that all Apps in the group are part of the same genre. Only Apps that are part of the genre selected will give a score. As an example, Amazon isn't part of the "Supermarket" subgenre, which is why it's showing n/a in the image.

For Monetization, those will also show as n/a if the app does not monetize in the app. You can create your own criteria in the top left and take out the Monetization column if you'd like!