Table 4.

Cluster purity and F value expressed by emotional features.

Number of topics	40	50	60	70
Purity	0.6312	0.6486	0.6524	0.6784
F value	0.6214	0.6312	0.6402	0.6747
Number of topics	80	100	110	120
Purity	0.6873	0.6796	0.6724	0.6605
F value	0.6730	0.6691	0.6682	0.6596