The question is whether we can find a correlation between two sets of grades (categorical data).
Let’s say we have a dog competition and there are 1000 dogs participating.
There are two rounds of assessment:
First round: dog owners give their assessment on the scale from A to C. Where A is excellent and C is bad. There are four criteria for assessment during both tours (behaviour etc).
Second round: one judge gives his assessment of one dog based on the same assessment criteria as in round 1. however, grades vary from M - meeting expectation, E - exceeding expectation, B - Bellow expectation.
We understand that M is B, E is A and B is C.
After two rounds our table would look like:
| dog | round one | round two | | --------------- | --------- | --------- | | Dog1_criteria1 | A | B | | Dog1_criteria2 | A | E | | Dog1_criteria3 | A | E | | Dog1_criteria4 | B | M | | Dog2_criteria1 | A | E | | Dog2_criteria2 | B | M | | Dog2_criteria3 | A | E | | Dog2_criteria4 | C | B | ....
How do we find a correlation between the two sets of answers?(regardless criteria and based on criteria).