Table 9.

Results of TF-IDF with SVM classifications (12 granularities—Functional Requirements and Non-Functional Requirements).

SVM Classification Using TF-IDF (12 Granularities)
	Precision	Recall	F1-score
Availability (A)	0.77	0.74	0.75
Functional Requirement (F)	0.87	0.92	0.89
Fault Tolerance (FT)	0.70	0.39	0.50
Legal & Licensing (L)	0.88	0.47	0.61
Look & Feel (LF)	0.78	0.65	0.71
Maintainability (MN)	0.52	0.50	0.51
Operability (O)	0.64	0.53	0.58
Performance (PE)	0.82	0.82	0.82
Portability (PO)	0.50	0.17	0.25
Scalability (SC)	0.57	0.55	0.56
Security (SE)	0.71	0.77	0.74
Usability (US)	0.66	0.72	0.69