Table 2.

Comparison of results for experiment 1 with different numbers of clusters (k).

k	Without feature selection			Thirteen features			Seven features
	Precision	Recall	F1-measure	Precision	Recall	F1-measure	Precision	Recall	F1-measure
3	0.77	0.74	0.70	0.73	0.80	0.76	0.73	0.79	0.76
4	0.77	0.79	0.77	0.81	0.82	0.83	0.87	0.88	0.89
5	0.74	0.74	0.74	0.85	0.84	0.86	0.95	0.96	0.95
6	0.76	0.76	0.76	0.87	0.84	0.87	0.93	0.91	0.93
7	0.73	0.73	0.73	0.84	0.86	0.85	0.94	0.95	0.94
8	0.79	0.70	0.79	0.81	0.82	0.81	0.93	0.94	0.93