We report the Spearman's rank correlation coefficient ρ, Pearson's product-moment correlation coefficient r, and the root mean square error (RMSE) between the predicted scores and the gold standard on our test set, which are considered more appropriate metrics for evaluating essay scoring systems (Yannakoudakis and Cummins, 2015).
we also report Cohen's κ with quadratic weights, which was the evaluation metric used in the Kaggle competition.