Comparing the machine learning grading of essays with _just_ two human graders is plain stupidity[1]. By coincidence, all three might be same. And the probabil

Comparing the machine learning grading of essays with _just_ two human graders is plain stupidity[1]. By coincidence, all three might be same. And the probability of that coincidence is way too high. [1]. http://en.wikipedia.org/wiki/Sampling_bias http://en.wikipedia.org/wiki/Sampling_bias