Table 16: NPMI results by level of hierarchy compared with uHTM strategies.
Datasets	Level	CluNMF	hLDA	hPAM	HSOC	KHTM
20News	1 Level	1.0232 ± 0.0000	0.9866 ± 0.0000	1.0314 ± 0.0000	0.3025 ± 0.2030	0.0346 ± 0.0000
2 Level	1.1925 ± 0.1096	1.3775 ± 0.1562	1.1515 ± 0.0843	0.3221 ± 0.1925	0.2698 ± 0.1107
3 Level	1.2060 ± 0.1183	1.4500 ± 0.1361	1.1308 ± 0.0857	0.3356 ± 0.2301	0.2137 ± 0.1775
ACM	1 Level	1.0955 ± 0.1047	0.9653 ± 0.0000	1.1710 ± 0.0000	0.6783 ± 0.2517	0.4138 ± 0.0000
2 Level	1.0955 ± 0.1047	1.3447 ± 0.1152	1.1661 ± 0.0721	0.6292 ± 0.2627	0.6458 ± 0.2348
3 Level	1.0320 ± 0.0716	1.4782 ± 0.0873	1.1255 ± 0.1006	0.6373 ± 0.2791	0.1470 ± 0.1382
AngryBirds	1 Level	0.9416 ± 0.0000	1.2087 ± 0.0000	1.2447 ± 0.0000	1.1833 ± 0.0379	1.2514 ± 0.0000
2 Level	1.1148 ± 0.1406	1.2806 ± 0.0502	1.2878 ± 0.0569	1.1797 ± 0.0343	1.1949 ± 0.0341
3 Level	1.1532 ± 0.1120	1.3300 ± 0.0229	1.2225 ± 0.0777	1.1822 ± 0.0410	1.2626 ± 0.0256
Dropbox	1 Level	0.9895 ± 0.0000	1.1067 ± 0.0000	1.2108 ± 0.0000	1.1641 ± 0.0264	1.1113 ± 0.0000
2 Level	1.1191 ± 0.0966	1.2912 ± 0.0507	1.2193 ± 0.0613	1.1590 ± 0.0426	1.1794 ± 0.0472
3 Level	1.1489 ± 0.0905	1.3459 ± 0.0318	1.1751 ± 0.0889	1.1747 ± 0.0432	1.3099 ± 0.0288
Evernote	1 Level	0.9707 ± 0.0000	1.1173 ± 0.0000	1.1561 ± 0.0000	1.1660 ± 0.0490	1.0959 ± 0.0000
2 Level	1.0048 ± 0.0658	1.3185 ± 0.0671	1.1936 ± 0.0806	1.1725 ± 0.0385	1.1449 ± 0.0305
3 Level	1.1109 ± 0.1249	1.3876 ± 0.0475	1.1397 ± 0.0606	1.1916 ± 0.0452	1.3306 ± 0.0464
Facebook	1 Level	1.0722 ± 0.1251	1.1125 ± 0.0000	1.2397 ± 0.0000	1.1611 ± 0.0444	1.1435 ± 0.0000
2 Level	1.1471 ± 0.1405	1.2787 ± 0.0575	1.1766 ± 0.0346	1.1707 ± 0.0522	1.1124 ± 0.0168
3 Level	1.1993 ± 0.1170	1.4197 ± 0.0314	1.1573 ± 0.0550	1.1836 ± 0.0594	1.3036 ± 0.0319
InfoVis-Vast	1 Level	1.0569 ± 0.0000	1.0817 ± 0.0000	1.0517 ± 0.0000	1.1783 ± 0.0507	1.1137 ± 0.0000
2 Level	1.0604 ± 0.0589	1.0673 ± 0.0066	1.2105 ± 0.0526	1.1824 ± 0.0490	1.1466 ± 0.0570
3 Level	1.1091 ± 0.0881	1.2228 ± 0.0440	1.1617 ± 0.0639	1.2000 ± 0.0504	1.1820 ± 0.0457
Pinterest	1 Level	1.1468 ± 0.1059	1.1385 ± 0.0000	1.1699 ± 0.0000	1.1522 ± 0.0531	1.1640 ± 0.0000
2 Level	1.1850 ± 0.0991	1.2690 ± 0.0321	1.2962 ± 0.0771	1.1617 ± 0.0495	1.1918 ± 0.0331
3 Level	1.2467 ± 0.0772	1.2938 ± 0.0236	1.2070 ± 0.0655	1.1892 ± 0.0441	1.2269 ± 0.0244
TripAdvisor	1 Level	0.9554 ± 0.0000	1.0859 ± 0.0000	1.1188 ± 0.0000	1.1275 ± 0.0247	1.1113 ± 0.0000
2 Level	1.0465 ± 0.0663	1.2975 ± 0.0563	1.2573 ± 0.0611	1.1441 ± 0.0320	1.1783 ± 0.0327
3 Level	1.1155 ± 0.1087	1.3782 ± 0.0345	1.1744 ± 0.0646	1.1534 ± 0.0310	1.3204 ± 0.0206
1 Level	0.9102 ± 0.0000	1.0165 ± 0.0000	1.2447 ± 0.0000	1.2161 ± 0.0827	1.1532 ± 0.0000
Tweets	2 Level	1.0231 ± 0.0463	1.3655 ± 0.0525	1.2616 ± 0.0339	1.2282 ± 0.0679	1.1491 ± 0.0227
3 Level	1.0592 ± 0.1151	1.4350 ± 0.0246	1.2092 ± 0.0661	1.2242 ± 0.0650	1.3304 ± 0.0323
Uber	1 Level	1.0136 ± 0.0000	1.1040 ± 0.0000	1.1916 ± 0.0000	1.1716 ± 0.0340	1.1249 ± 0.0000
2 Level	1.0353 ± 0.0867	1.2679 ± 0.0557	1.2252 ± 0.0630	1.1684 ± 0.0371	1.1468 ± 0.0195
3 Level	1.1431 ± 0.1329	1.3794 ± 0.0360	1.1277 ± 0.0600	1.1663 ± 0.0396	1.3048 ± 0.0474
1 Level	0.9615 ± 0.0000	1.1816 ± 0.0000	1.2917 ± 0.0000	1.1685 ± 0.0421	1.1781 ± 0.0000
WhatsApp	2 Level	0.9975 ± 0.0661	1.2235 ± 0.0270	1.2748 ± 0.0427	1.1675 ± 0.0401	1.2057 ± 0.0394
3 Level	1.1380 ± 0.1030	1.2257 ± 0.0110	1.2095 ± 0.0644	1.1773 ± 0.0430	1.2991 ± 0.0178