[Retracted] Design of Automatic Scoring System for Oral English Test Based on Sequence Matching and Big Data Analysis

Table 1

Correlation coefficient between all characteristics and expert score.

Features	Correlation coefficient with expert score
Number of words per unit time	0.501
Syntax tree depth	0.295
Normalized syntax tree depth	0.338
Score of the whole syntax tree	−0.414
Manhattan similarity	0.634
Dice coefficient	0.692
Cosine similarity based on word frequency	0.716
Pearson coefficient	0.792