Table 5. Comparison of the correlation coefficient and SelectKBest scores based on the features.

Comparison of features used.

Feature types	Features used (Krishnamoorthy, 2015)	Features used (this research)
Linguistic	State Verb, State Action Verb, Interpretive Action Verb, Descriptive Action Verb, Adjective	Interpretive Action Verb, Noun, Adverb, Adjective, Review Length, Capitalized Words, Sentences in a Review
Metadata	Reviewing Date, Product Release Date	Review Name Existence, Review Location Existence, Rating
Readability	Flesch-Kincaid Grade Level, SMOG Index, Gunning Fog Index, Automated Readability Index, Coleman-Liau	–
Subjectivity	Subjectivity Score	Subjectivity Score
Polarity	–	Polarity Score

Notes.

The bold values reflect the differences between the features employed in this research compared to previous research (Krishnamoorthy, 2015).