Comparing diagnostic tests - graphically demonstration


New Member

This is very basic but really struggling to find the correct terminology to find out what I want to do. I have collected data on two methods of testing the same thing e.g test 1 and test 2. Each tests has it's own inherent benefits and negatives. I want to demonstrate on a graph how often these tests agree and how often they do not. In my mind axis x test 1 positive or negative, and axis y test positive or negative. I have drawn how I invisage this looking and how it could look if I did it by hand but want to do it on the computer for a presentation. I have googled but can't find simple terminology to describe/find what I am after. Can anyone help me plot something like this on the computer or find terminology so I can find out for myself? (Please see attached image!)

Thanks in advance