I have 5 radiologists who classified tumors in 3 stages (Stage 1, Stage 2, Stage 3). They did the classification manually putting numbers 1 = Stage 1 , 2 = Stage 2 and 3 = Stage 3 on each region. Each patient has about 10-14 tumors. For each patient I want to see how many tumors they classified the same. How can I do that?