The Effects of Feature Optimization on High-Dimensional Essay Data

Table 4

Effective feature list.

Number of times selected	Feature name	Meaning of feature
130	posNumINVoca	Number of vocabularies with IN POS tag
130	posNumIN	Number of words with IN POS tag
130	lmPosTrigramVoca	The number of different POS trigrams
130	lmPosTrigramOccMore3	The ratio of POS trigrams occurred more than 3
130	lmPosTrigramOccMore2Less5	The ratio of POS trigrams occurred more than 2 but fewer than 5
130	lmPosTrigramOccMore2Less10	The ratio of POS trigrams occurred more than 2 but fewer than 10
130	lmPosTrigramOccMore2	The ratio of POS trigrams occurred more than 2
130	lmNumVoca4Root	Biquadrate of the number of vocabularies
130	lmNumVoca	The number of vocabularies
130	lmLexWordOccMore5	The number of different words occurred more than 5
130	lmLexWordOccMore4	The number of different words occurred more than 4
130	lmLexWordOccMore3	The number of different words occurred more than 3
130	lmLexWordOccMore2Less5	The number of different words occurred more than 2 but fewer than 5
130	lmLexWordOccMore2Less10	The number of different words occurred more than 2 but fewer than 10
130	lmLexWordOccMore2	The number of different words occurred more than 2
130	lmLexWordOccMore1Less5	The number of different words occurred more than 5
130	lmLexWordOccMore1Less10	The number of different words occurred more than 10
130	lmLexWordOccMore1	The number of different words occurred more than 1
130	lmLexBigramVoca	The number of different lexical bigrams
130	lmLexBigramOccMore2Less5	The ratio of lexical bigrams occurred more than 2 but fewer than 5
130	lmAvgLexWordDistance	The average distance of same words
130	lmAvgLemmaWordDistance	The average distance of same lemmas
130	cNumWordLen8	The number of words whose length is more than 8 characters
130	cNumWordLen7	The number of words whose length is more than 7 characters
130	cNumWordLen6	The number of words whose length is more than 6 characters
130	cNumWordLen5	The number of words whose length is more than 5 characters
130	cNumWord	The number of all words
130	cNumNotStopWord	The number of all words except stop words
130	cNumNotStopVoca	The number of all vocabularies except stop words
130	cNumMidd	The number of words in the intermediate dictionary
130	cNumElem	The number of words in the elementary dictionary
130	cNumChar	The number of all characters
130	cCharNotStopWord	The number of all characters except stop words
129	posNumNN	The number of words with NN POS tag
129	lmLexBigramOccMore2Less10	The ratio of lexical bigrams occurred more than 2 but fewer than 10
129	lmLexBigramOccMore2	The ratio of lexical bigrams occurred more than 2
128	posNumJJVoca	The number of vocabularies with NN POS tag
128	posNumJJ	The number of words with NN POS tag
126	cNumWordLen10	The number of words whose length is more than 10 characters
125	posNumNNSVoca	The number of vocabularies with NNS POS tag