Conceptualizing Discussions on the Dark Web: An Empirical Topic Modeling Approach

Table 3

Coherence scores for LDA.

	k = 5			k = 10			k = 15			k = 20			k = 25
	Run 1	Run 2	Run 3	Run 1	Run 2	Run 3	Run 1	Run 2	Run 3	Run 1	Run 2	Run 3	Run 1	Run 2	Run 3
CUMASS	−4.5818	−3.7039	−3.4599	−4.0605	−3.7081	−3.7773	−4.1671	−4.3727	−4.9998	−4.2603	−4.1414	−4.1743	−4.5056	−4.2672	−5.4747
STDEV	0.5900			0.1867			0.4337			0.0614			0.6396
CUCI	−1.9514	−1.2642	−1.4639	−1.7021	−1.7921	−1.9673	−1.9565	−1.9007	−2.2416	−1.5066	−1.6862	−1.7135	−1.6519	−1.7577	−2.4349
STDEV	0.3535			0.1349			0.1829			0.1124			0.4248
CNPMI	0.0066	0.0321	0.0196	0.0245	0.0185	0.0089	0.0287	0.0242	0.0041	0.0509	0.0452	0.0359	0.0445	0.0341	0.0133
STDEV	0.0128			0.0079			0.0131			0.0076			0.0159
CV	0.6756	0.6281	0.6471	0.7006	0.6738	0.6943	0.7063	0.7249	0.7256	0.7126	0.7007	0.7438	0.7622	0.7332	0.7606
STDEV	0.0239			0.0140			0.0110			0.0222			0.0163
	k = 30			k = 35			k = 40			k = 45			k = 50
	Run 1	Run 2	Run 3	Run 1	Run 2	Run 3	Run 1	Run 2	Run 3	Run 1	Run 2	Run 3	Run 1	Run 2	Run 3
CUMASS	−4.7084	−4.5987	−4.6954	−5.5073	−4.8649	−5.2566	−5.1379	−5.6170	−5.1214	−5.7629	−5.2985	−5.3391	−4.8740	−5.6395	−5.7052
STDEV	0.0599			0.3238			0.2815			0.2572			0.4621
CUCI	−1.9416	−1.6969	−1.8742	−2.4134	−1.9732	−2.0141	−2.2374	−2.3828	−2.2753	−2.2347	−2.1141	−2.0447	−2.0721	−2.0365	−2.4476
STDEV	0.1264			0.2432			0.0754			0.0962			0.2278
CNPMI	0.0338	0.0390	0.0355	0.0104	0.0311	0.0278	0.0200	0.0159	0.0195	0.0211	0.0275	0.0326	0.0229	0.0297	0.0108
STDEV	0.0026			0.0111			0.0022			0.0057			0.0096
CV	0.7468	0.7597	0.7468	0.7602	0.7932	0.7568	0.7535	0.7673	0.7535	0.7741	0.7895	0.7737	0.7630	0.7725	0.7763
STDEV	0.0074			0.0201			0.0080			0.0090			0.0069