Table 2 Comparison of ClusTop algorithm against various baselines, in terms of Topic Coherence (TC) and Pointwise Mutual Information (PMI) for the top 5, 10, 15 and 20 keywords

− 37.6 (21)

− 5.5 (15)

− 34.1 (15)

− 7.7 (14)

− 37.9 (18)

− 14.4 (17)

(16.7)

− 171.0 (21)

− 49.2 (16)

− 160.8 (17)

− 39.5 (15)

− 173.4 (18)

− 67.5 (19)

(17.7)

− 36.6 (20)

7.3 (8)

− 35.9 (17)

1.2 (9)

− 42.5 (22)

− 16.4 (18)

(15.7)

− 153.4 (20)

− 29.6 (13)

− 158.2 (16)

− 25.8 (13)

− 194.8 (21)

− 63.4 (18)

(16.8)

− 30.9 (17)

10.7 (5)

− 35.8 (16)

− 2.6 (13)

− 42.0 (21)

− 18.2 (19)

(15.2)

− 122.6 (16)

− 16.1 (12)

− 166.5 (19)

− 25.1 (12)

− 194.2 (20)

− 73.5 (21)

(16.7)

− 23.3 (12)

19.6 (1)

− 32.3 (14)

4.7 (7)

− 37.9 (18)

− 11.2 (14)

(11.0)

− 81.4 (12)

7.1 (4)

− 140.8 (15)

− 14.9 (11)

− 169.9 (17)

− 50.7 (15)

(12.3)

− 7.1 (2)

5.8 (9)

− 14.8 (4)

0.3 (11)

− 14.1 (4)

2.6 (6)

(6.0)

− 19.4 (2)

2.3 (8)

− 54.9 (5)

− 6.9 (8)

− 47.8 (4)

4.4 (5)

(5.3)

− 17.1 (6)

10.6 (6)

− 21.4 (8)

6.9 (5)

− 22.8 (10)

− 0.3 (10)

(7.5)

− 64.7 (8)

2.9 (6)

− 90.5 (10)

− 3.6 (7)

− 97.8 (14)

− 14.1 (10)

(9.2)

− 17.9 (8)

− 7.8 (16)

− 22.8 (10)

− 9.3 (15)

− 22.5 (8)

− 7.9 (12)

(11.5)

− 69.3 (9)

− 35.7 (14)

− 87.2 (9)

− 35.5 (14)

− 62.1 (7)

− 20.9 (11)

(10.7)

− 9.4 (3)

16.6 (3)

− 11.0 (2)

18.2 (1)

− 8.9 (2)

21.2 (1)

(2.0)

− 28.0 (3)

40.3 (2)

− 32.5 (2)

48.4 (1)

− 18.4 (1)

48.6 (2)

(1.8)

− 10.5 (4)

18.8 (2)

− 10.4 (1)

18.0 (2)

− 8.6 (1)

20.3 (2)

(2.0)

− 31.8 (5)

45.7 (1)

− 30.7 (1)

45.5 (2)

− 19.0 (2)

48.7 (1)

(2.0)

− 30.9 (17)

− 1.6 (14)

− 40.2 (19)

− 27.6 (19)

− 24.2 (11)

10.3 (3)

(13.8)

− 137.6 (18)

− 57.7 (17)

− 198.3 (21)

− 131.1 (20)

− 88.5 (12)

9.1 (4)

(15.3)

− 6.3 (1)

5.4 (10)

− 12.8 (3)

0.9 (10)

− 13.1 (3)

2.6 (6)

(5.5)

− 16.2 (1)

1.5 (9)

− 47.3 (3)

− 7.3 (9)

− 43.7 (3)

2.2 (6)

(5.2)

− 28.7 (14)

− 11.4 (18)

− 41.8 (20)

− 19.8 (18)

− 17.6 (5)

4.6 (4)

(13.2)

− 132.4 (17)

− 72.3 (19)

− 185.6 (20)

− 102.5 (18)

− 63.8 (8)

− 2.5 (9)

(15.2)

− 17.6 (7)

− 9.1 (17)

− 32.0 (13)

− 15.6 (17)

− 29.5 (14)

− 11.3 (15)

(13.8)

− 71.2 (10)

− 41.0 (15)

− 136.3 (14)

− 64.7 (17)

− 97.9 (15)

− 33.7 (14)

(14.2)

− 27.2 (13)

− 23.8 (20)

− 38.7 (18)

− 32.1 (20)

− 26.6 (13)

− 19.2 (21)

(17.5)

− 84.0 (13)

− 83.3 (20)

− 133.6 (13)

− 113.9 (19)

− 87.7 (11)

− 60.7 (16)

(15.3)

− 29.0 (15)

− 23.8 (21)

− 45.1 (21)

− 38.4 (21)

− 25.7 (12)

− 18.3 (20)

(18.3)

− 97.3 (14)

− 93.3 (21)

− 166.1 (18)

− 144.0 (21)

− 85.1 (10)

− 62.9 (17)

(16.8)

− 34.4 (19)

8.3 (7)

− 30.9 (12)

11.0 (4)

− 37.7 (17)

− 14.3 (16)

(12.5)

− 146.1 (19)

− 5.4 (11)

− 126.8 (12)

8.1 (4)

− 179.9 (19)

− 69.0 (20)

(14.2)

− 19.7 (11)

11.4 (4)

− 18.5 (5)

16.3 (3)

− 33.7 (16)

− 7.3 (11)

(8.3)

− 73.9 (11)

8.5 (3)

− 52.9 (4)

14.3 (3)

− 153.6 (16)

− 30.4 (12)

(8.2)

− 11.2 (5)

4.8 (12)

− 19.2 (6)

0.3 (11)

− 22.6 (9)

4.0 (5)

(8.0)

− 29.9 (4)

-0.3 (10)

− 70.1 (8)

− 9.0 (10)

− 70.3 (9)

11.9 (3)

(7.3)

− 30.9 (17)

− 13.9 (19)

− 26.7 (11)

− 12.0 (16)

− 29.5 (14)

− 10.9 (13)

(15.0)

− 119.1 (15)

− 59.3 (18)

− 99.4 (11)

− 43.6 (16)

− 95.7 (13)

− 31.9 (13)

(14.3)

− 18.7 (9)

3.7 (13)

− 21.6 (9)

3.1 (8)

− 19.9 (7)

0.7 (9)

(9.2)

− 53.3 (6)

2.7 (7)

− 69.6 (7)

6.9 (5)

− 58.8 (6)

0.3 (8)

(6.5)

− 19.6 (10)

5.2 (11)

− 20.2 (7)

5.0 (6)

− 19.6 (6)

1.9 (8)

(8.0)

− 54.0 (7)

3.4 (5)

− 65.2 (6)

5.4 (6)

− 58.2 (5)

0.4 (7)

(6.0)

− 74.7 (24)

− 74.4 (24)

− 66.9 (24)

− 62.2 (24)

− 54.2 (24)

− 43.1 (24)

(24.0)

− 323.5 (24)

− 307.5 (24)

− 297.1 (24)

− 269.2 (24)

− 251.3 (24)

− 191.9 (24)

(24.0)

− 51.2 (22)

− 43.8 (22)

− 55.1 (23)

− 42.9 (22)

− 41.5 (20)

− 23.4 (22)

(21.8)

− 247.1 (22)

− 185.4 (22)

− 256.8 (22)

− 199.2 (22)

− 206.6 (22)

− 112.5 (22)

(22.0)

− 52.8 (23)

− 45.9 (23)

− 54.1 (22)

− 45.3 (23)

− 47.3 (23)

− 27.7 (23)

(22.8)

− 250.2 (23)

− 198.8 (23)

− 258.6 (23)

− 206.5 (23)

− 225.5 (23)

− 136.4 (23)

(23.0)

− 409.7 (21)

− 157.4 (17)

− 382.6 (19)

− 115.5 (16)

− 403.5 (18)

− 147.6 (21)

(18.7)

− 768.2 (21)

− 318.1 (19)

− 695.1 (19)

− 234.8 (17)

− 732.7 (18)

− 247.8 (21)

(19.2)

− 357.2 (20)

− 108.3 (15)

− 360.3 (17)

− 77.2 (12)

− 447.9 (20)

− 116.5 (18)

(17.0)

− 645.5 (20)

− 212.3 (16)

− 633.7 (17)

− 147.8 (13)

− 794.7 (20)

− 165.4 (18)

(17.3)

− 289.2 (16)

− 83.1 (13)

− 382.0 (18)

− 86.2 (15)

− 451.6 (21)

− 145.4 (20)

(17.2)

− 530.2 (16)

− 170.0 (14)

− 674.8 (18)

− 183.1 (14)

− 804.0 (21)

− 222.8 (19)

(17.0)

− 179.9 (13)

− 24.2 (10)

− 324.4 (15)

− 82.8 (14)

− 389.5 (17)

− 98.6 (17)

(14.3)

− 319.3 (13)

− 64.1 (10)

− 569.2 (15)

− 189.6 (15)

− 692.0 (17)

− 141.3 (17)

(14.5)

− 38.4 (2)

− 4.0 (5)

− 116.4 (5)

− 11.3 (7)

− 98.6 (6)

13.1 (4)

(4.8)

− 63.7 (2)

− 11.0 (6)

− 195.2 (7)

− 9.7 (6)

− 148.8 (9)

28.2 (4)

(5.7)

− 139.1 (8)

− 23.3 (9)

− 208.5 (11)

− 31.4 (9)

− 219.9 (15)

− 29.6 (11)

(10.5)

− 242.1 (8)

− 63.7 (9)

− 363.5 (11)

− 86.9 (9)

− 384.7 (15)

− 36.4 (10)

(10.3)

− 160.2 (10)

− 77.7 (12)

− 183.4 (9)

− 70.6 (11)

− 75.6 (3)

− 24.8 (10)

(9.2)

− 292.1 (11)

− 127.5 (11)

− 295.8 (10)

− 107.8 (11)

− 75.6 (3)

− 24.8 (8)

(9.0)

− 49.9 (3)

72.7 (2)

− 61.4 (2)

96.8 (1)

− 19.3 (1)

52.5 (2)

(1.8)

− 73.4 (3)

111.3 (2)

− 95.7 (2)

161.4 (1)

− 19.3 (1)

52.5 (3)

(2.0)

− 59.5 (4)

87.5 (1)

− 60.0 (1)

94.2 (2)

− 20.7 (2)

54.8 (1)

(1.8)

− 92.4 (4)

145.3 (1)

− 95.0 (1)

157.7 (2)

− 20.7 (2)

54.8 (2)

(2.0)

− 311.9 (18)

− 172.7 (19)

− 480.2 (21)

− 306.9 (21)

− 177.0 (14)

− 14.8 (8)

(16.8)

− 567.7 (17)

− 336.0 (21)

− 903.7 (21)

− 562.7 (21)

− 298.8 (14)

− 50.2 (13)

(17.8)

− 32.3 (1)

− 4.2 (6)

− 99.8 (3)

− 16.3 (8)

− 90.7 (5)

8.7 (5)

(4.7)

− 54.8 (1)

− 9.5 (5)

− 169.0 (3)

− 22.2 (7)

− 143.6 (6)

21.9 (5)

(4.5)

− 309.9 (17)

− 173.6 (20)

− 444.0 (20)

− 242.1 (19)

− 131.8 (9)

− 17.5 (9)

(15.7)

− 575.1 (18)

− 316.4 (18)

− 811.4 (20)

− 425.6 (19)

− 221.7 (12)

− 35.0 (9)

(16.0)

− 166.4 (11)

− 96.1 (14)

− 304.6 (14)

− 127.6 (17)

− 143.0 (12)

− 45.3 (13)

(13.5)

− 303.3 (12)

− 166.6 (13)

− 530.9 (14)

− 195.1 (16)

− 147.6 (8)

− 46.9 (12)

(12.5)

− 167.4 (12)

− 166.8 (18)

− 281.9 (13)

− 237.7 (18)

− 116.9 (8)

− 79.1 (15)

(14.0)

− 274.1 (10)

− 268.2 (17)

− 476.9 (12)

− 390.7 (18)

− 122.6 (5)

− 82.5 (15)

(12.8)

− 201.1 (14)

− 197.3 (21)

− 350.3 (16)

− 299.5 (20)

− 134.5 (10)

− 95.8 (16)

(16.2)

− 335.0 (14)

− 329.3 (20)

− 591.2 (16)

− 494.6 (20)

− 160.1 (10)

− 115.3 (16)

(16.0)

− 326.6 (19)

− 57.3 (11)

− 278.7 (12)

− 42.5 (10)

− 422.5 (19)

− 143.4 (19)

(15.0)

− 599.9 (19)

− 155.4 (12)

− 492.7 (13)

− 122.3 (12)

− 766.5 (19)

− 239.6 (20)

(15.8)

− 152.7 (9)

− 17.5 (8)

− 102.1 (4)

− 1.8 (5)

− 350.0 (16)

− 50.1 (14)

(9.3)

− 262.2 (9)

− 56.7 (8)

− 169.8 (4)

− 26.5 (8)

− 615.2 (16)

− 67.0 (14)

(9.8)

− 60.7 (5)

− 6.0 (7)

− 150.6 (8)

− 10.5 (6)

− 138.9 (11)

29.7 (3)

(6.7)

− 99.3 (5)

− 11.4 (7)

− 257.4 (8)

− 2.4 (5)

− 227.4 (13)

58.0 (1)

(6.5)

− 273.6 (15)

− 123.9 (16)

− 193.0 (10)

− 78.1 (13)

− 152.4 (13)

− 43.1 (12)

(13.2)

− 480.9 (15)

− 202.2 (15)

− 289.8 (9)

− 103.9 (10)

− 167.3 (11)

− 46.4 (11)

(11.8)

− 95.4 (6)

4.1 (4)

− 128.1 (7)

25.2 (3)

− 89.3 (4)

5.5 (6)

(5.0)

− 146.2 (6)

9.5 (4)

− 192.2 (6)

53.3 (3)

− 102.6 (4)

12.2 (7)

(5.0)

− 96.2 (7)

4.3 (3)

− 122.6 (6)

14.9 (4)

− 108.3 (7)

4.1 (7)

(5.7)

− 149.5 (7)

11.3 (3)

− 185.6 (5)

30.2 (4)

− 146.6 (7)

13.0 (6)

(5.3)

− 722.5 (24)

− 659.1 (24)

− 695.0 (24)

− 619.0 (24)

− 593.5 (24)

− 442.7 (24)

(24.0)

− 1279.6 (24)

− 1133.6 (24)

− 1262.1 (24)

− 1102.0 (24)

− 1083.2 (24)

− 790.0 (24)

(24.0)

− 607.9 (22)

− 435.4 (22)

− 611.4 (22)

− 449.2 (22)

− 500.7 (22)

− 271.5 (22)

(22.0)

− 1134.2 (22)

− 794.2 (22)

− 1120.9 (22)

− 805.6 (22)

− 930.7 (22)

− 463.1 (22)

(22.0)

− 611.6 (23)

− 465.7 (23)

− 613.9 (23)

− 477.7 (23)

− 540.9 (23)

− 316.9 (23)

(23.0)

− 1141.5 (23)

− 850.2 (23)

− 1130.6 (23)

− 855.9 (23)

− 981.9 (23)

− 566.6 (23)

(23.0)