[Retracted] Automatic Scoring of English Essays Based on Machine Learning Technology in a Wireless Network Environment

Table 5

Lexical diversity features.

Features serial number	Feature category	Feature coding	Calculation method
13	Word species/word order ratio	TTR	T/N
14	Square root TTR	TTR_ROOT
15	Logarithmic TTR	ITR_LOG
16	Continuous sample TTR	TTR_SEG	Mean TTR of consecutive intercept samples
17	Random sample TTR	Feature coding	TTR mean of random intercept samples