Missing values?!? Isn't avoiding those the whole reason we even do DIA? I thought there weren't any?!?
Yeah, there still are, particularly in really complex matrices. If you want to assess the levels of it, you can manually search or you can use -- OptiMissP!
Don't feel like reading? Me either! (Just kidding, it's a pretty cool paper.)
Or you can just mess around with their great Shiny app here!