Introduction
Table 7: TOEFL11Subset Feature Group Performance
['[BOLD] Feature Group', '[BOLD] Pearson Corr.', '[BOLD] Corr. without prompt', '[BOLD] Corr. prompt and L1']
TOEFL11Subset corpus is released as a categorical corpus. However, proficiency ratings are ordinal in nature and are not categories independent from each other. Further, to enable a comparison with FCE which has a numeric scale, TOEFLSubset was modeled as regression, using SMOReg algorithm. The model achieved a Pearson correlation of 0.8 and a Mean Absolute Error (MAE) of 0.4 with actual proficiency values.