r - Find correlation between two sets of categorical data

Question

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? Thank you!

question from:https://stackoverflow.com/questions/65946948/find-correlation-between-two-sets-of-categorical-data

Answer 1

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