Table 7.

Results of BoW, TF-IDF and Chi Squared classification with SVM, MNB, kNN and LR with 11 granularities (Non-Functional Requirements).

	Non-Functional Requirements Classification
	BoW			TF-IDF			${\mathrm{CHI}}^2$
	Precision	Recall	F1-score	Precision	Recall	F1-score	Precision	Recall	F1-score
SVM	0.68	0.67	0.66	0.73	0.73	0.72	0.72	0.71	0.71
MNB	0.71	0.73	0.72	0.71	0.71	0.71	0.69	0.70	0.68
kNN	0.56	0.48	0.49	0.66	0.66	0.66	0.62	0.63	0.62
LR	0.71	0.71	0.70	0.75	0.75	0.74	0.70	0.71	0.70