Descriptive statistics and correlations
| Mean | SD | Min. | Max. | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | ||
| (1) Topic usage in East-Asia | 1.81 | 1.86 | 0.00 | 9.00 | 1.00 | ||||||||
| (2) Topic usage in Europe | 3.80 | 3.14 | 0.00 | 18.0 | 0.26 | 1.00 | |||||||
| (3) Topic usage in North-America | 9.96 | 7.89 | 0.00 | 37.0 | −0.02 | 0.10 | 1.00 | ||||||
| (4) Topic usage in other countries | 1.69 | 1.56 | 0.00 | 8.00 | 0.21 | 0.20 | 0.00 | 1.00 | |||||
| (5) East-Asian origin | 0.09 | 0.29 | 0.00 | 1.00 | 0.35 | −0.06 | −0.14 | 0.20 | 1.00 | ||||
| (6) European origin | 0.18 | 0.38 | 0.00 | 1.00 | 0.06 | 0.05 | −0.19 | −0.11 | −0.05 | 1.00 | |||
| (7) North-American origin | 0.82 | 0.38 | 0.00 | 1.00 | −0.08 | −0.07 | 0.18 | 0.04 | −0.13 | −0.53 | 1.00 | ||
| (8) Other origin | 0.09 | 0.29 | 0.00 | 1.00 | 0.07 | −0.07 | −0.16 | −0.07 | −0.10 | −0.05 | −0.31 | 1.00 | |
| (9) Top 25 affiliated | 0.45 | 0.50 | 0.00 | 1.00 | 0.18 | −0.04 | −0.16 | 0.05 | −0.00 | −0.16 | 0.42 | −0.14 | |
| (10) Percentage female authors | 0.11 | 0.24 | 0.00 | 1.00 | 0.04 | 0.06 | −0.14 | 0.16 | 0.03 | −0.13 | 0.01 | 0.09 | |
| (11) One author | 2.76 | 0.38 | 1.61 | 3.40 | 0.36 | 0.15 | −0.37 | 0.14 | 0.23 | 0.17 | 0.03 | −0.01 | |
| (12) Two authors | 4.33 | 0.34 | 3.04 | 5.11 | 0.13 | −0.02 | −0.15 | 0.16 | 0.07 | −0.07 | 0.05 | 0.06 | |
| (13) Three authors | 0.49 | 0.50 | 0.00 | 1.00 | −0.15 | 0.14 | 0.48 | 0.12 | −0.16 | −0.19 | −0.07 | −0.10 | |
| (14) Four+authors | 0.33 | 0.47 | 0.00 | 1.00 | 0.00 | −0.01 | −0.29 | −0.16 | −0.14 | 0.23 | 0.05 | 0.00 | |
| (15) ln(Nr. of pages) | 0.13 | 0.34 | 0.00 | 1.00 | 0.10 | −0.13 | −0.22 | 0.04 | 0.19 | −0.10 | 0.02 | 0.09 | |
| (16) ln(Title length) | 0.06 | 0.24 | 0.00 | 1.00 | 0.16 | −0.10 | −0.13 | 0.02 | 0.36 | 0.10 | 0.01 | 0.07 | |
| (17) ln(1+ Article impact) | 4.72 | 1.61 | 0.00 | 7.93 | 0.37 | 0.32 | −0.24 | 0.20 | 0.15 | 0.19 | −0.05 | −0.05 | |
| (18) Total usage | 13.52 | 8.57 | 1.00 | 41.0 | 0.07 | 0.37 | 0.94 | 0.11 | −0.13 | −0.17 | 0.15 | −0.16 | |
| (19) Internationally focused | 0.67 | 0.47 | 0.00 | 1.00 | 0.02 | −0.05 | 0.13 | 0.17 | −0.08 | −0.17 | 0.12 | −0.08 | |
| (20) Asia-focused | 0.07 | 0.26 | 0.00 | 1.00 | 0.18 | −0.16 | −0.11 | 0.03 | 0.05 | −0.03 | 0.03 | −0.09 | |
| (21) Special issue | 0.16 | 0.37 | 0.00 | 1.00 | 0.09 | 0.05 | −0.15 | 0.16 | 0.15 | 0.15 | −0.08 | −0.14 | |
| (9) | (10) | (11) | (12) | (13) | (14) | (15) | (16) | (17) | (18) | (19) | (20) | (21) | |
| (10) Percentage female authors | −0.08 | 1.00 | |||||||||||
| (11) One author | 0.39 | 0.18 | 1.00 | ||||||||||
| (12) Two authors | 0.11 | 0.14 | 0.34 | 1.00 | |||||||||
| (13) Three authors | −0.31 | −0.10 | −0.30 | −0.09 | 1.00 | ||||||||
| (14) Four+authors | 0.10 | −0.00 | 0.13 | −0.01 | −0.68 | 1.00 | |||||||
| (15) ln(Nr. of pages) | 0.25 | 0.12 | 0.09 | 0.17 | −0.37 | −0.27 | 1.00 | ||||||
| (16) ln(Title length) | 0.11 | 0.05 | 0.24 | −0.03 | −0.24 | −0.18 | −0.10 | 1.00 | |||||
| (17) ln(1+ Article impact) | 0.13 | 0.25 | 0.49 | 0.16 | −0.29 | 0.21 | 0.02 | 0.16 | 1.00 | ||||
| (18) Total usage | −0.15 | −0.12 | −0.30 | −0.16 | 0.49 | −0.26 | −0.25 | −0.18 | −0.14 | 1.00 | |||
| (19) Internationally focused | −0.06 | −0.01 | 0.04 | −0.07 | 0.04 | −0.01 | −0.11 | 0.09 | 0.09 | 0.14 | 1.00 | ||
| (20) Asia-focused | −0.01 | 0.03 | −0.05 | −0.16 | −0.03 | −0.02 | −0.10 | 0.26 | 0.05 | −0.16 | 0.19 | 1.00 | |
| (21) Special issue | −0.12 | 0.19 | 0.15 | −0.01 | 0.01 | −0.01 | −0.09 | 0.12 | 0.34 | −0.13 | 0.24 | 0.10 | 1.00 |
| Mean | SD | Min. | Max. | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | ||
| (1) Topic usage in East-Asia | 1.81 | 1.86 | 0.00 | 9.00 | 1.00 | ||||||||
| (2) Topic usage in Europe | 3.80 | 3.14 | 0.00 | 18.0 | 0.26 | 1.00 | |||||||
| (3) Topic usage in North-America | 9.96 | 7.89 | 0.00 | 37.0 | −0.02 | 0.10 | 1.00 | ||||||
| (4) Topic usage in other countries | 1.69 | 1.56 | 0.00 | 8.00 | 0.21 | 0.20 | 0.00 | 1.00 | |||||
| (5) East-Asian origin | 0.09 | 0.29 | 0.00 | 1.00 | 0.35 | −0.06 | −0.14 | 0.20 | 1.00 | ||||
| (6) European origin | 0.18 | 0.38 | 0.00 | 1.00 | 0.06 | 0.05 | −0.19 | −0.11 | −0.05 | 1.00 | |||
| (7) North-American origin | 0.82 | 0.38 | 0.00 | 1.00 | −0.08 | −0.07 | 0.18 | 0.04 | −0.13 | −0.53 | 1.00 | ||
| (8) Other origin | 0.09 | 0.29 | 0.00 | 1.00 | 0.07 | −0.07 | −0.16 | −0.07 | −0.10 | −0.05 | −0.31 | 1.00 | |
| (9) Top 25 affiliated | 0.45 | 0.50 | 0.00 | 1.00 | 0.18 | −0.04 | −0.16 | 0.05 | −0.00 | −0.16 | 0.42 | −0.14 | |
| (10) Percentage female authors | 0.11 | 0.24 | 0.00 | 1.00 | 0.04 | 0.06 | −0.14 | 0.16 | 0.03 | −0.13 | 0.01 | 0.09 | |
| (11) One author | 2.76 | 0.38 | 1.61 | 3.40 | 0.36 | 0.15 | −0.37 | 0.14 | 0.23 | 0.17 | 0.03 | −0.01 | |
| (12) Two authors | 4.33 | 0.34 | 3.04 | 5.11 | 0.13 | −0.02 | −0.15 | 0.16 | 0.07 | −0.07 | 0.05 | 0.06 | |
| (13) Three authors | 0.49 | 0.50 | 0.00 | 1.00 | −0.15 | 0.14 | 0.48 | 0.12 | −0.16 | −0.19 | −0.07 | −0.10 | |
| (14) Four+authors | 0.33 | 0.47 | 0.00 | 1.00 | 0.00 | −0.01 | −0.29 | −0.16 | −0.14 | 0.23 | 0.05 | 0.00 | |
| (15) ln(Nr. of pages) | 0.13 | 0.34 | 0.00 | 1.00 | 0.10 | −0.13 | −0.22 | 0.04 | 0.19 | −0.10 | 0.02 | 0.09 | |
| (16) ln(Title length) | 0.06 | 0.24 | 0.00 | 1.00 | 0.16 | −0.10 | −0.13 | 0.02 | 0.36 | 0.10 | 0.01 | 0.07 | |
| (17) ln(1+ Article impact) | 4.72 | 1.61 | 0.00 | 7.93 | 0.37 | 0.32 | −0.24 | 0.20 | 0.15 | 0.19 | −0.05 | −0.05 | |
| (18) Total usage | 13.52 | 8.57 | 1.00 | 41.0 | 0.07 | 0.37 | 0.94 | 0.11 | −0.13 | −0.17 | 0.15 | −0.16 | |
| (19) Internationally focused | 0.67 | 0.47 | 0.00 | 1.00 | 0.02 | −0.05 | 0.13 | 0.17 | −0.08 | −0.17 | 0.12 | −0.08 | |
| (20) Asia-focused | 0.07 | 0.26 | 0.00 | 1.00 | 0.18 | −0.16 | −0.11 | 0.03 | 0.05 | −0.03 | 0.03 | −0.09 | |
| (21) Special issue | 0.16 | 0.37 | 0.00 | 1.00 | 0.09 | 0.05 | −0.15 | 0.16 | 0.15 | 0.15 | −0.08 | −0.14 | |
| (9) | (10) | (11) | (12) | (13) | (14) | (15) | (16) | (17) | (18) | (19) | (20) | (21) | |
| (10) Percentage female authors | −0.08 | 1.00 | |||||||||||
| (11) One author | 0.39 | 0.18 | 1.00 | ||||||||||
| (12) Two authors | 0.11 | 0.14 | 0.34 | 1.00 | |||||||||
| (13) Three authors | −0.31 | −0.10 | −0.30 | −0.09 | 1.00 | ||||||||
| (14) Four+authors | 0.10 | −0.00 | 0.13 | −0.01 | −0.68 | 1.00 | |||||||
| (15) ln(Nr. of pages) | 0.25 | 0.12 | 0.09 | 0.17 | −0.37 | −0.27 | 1.00 | ||||||
| (16) ln(Title length) | 0.11 | 0.05 | 0.24 | −0.03 | −0.24 | −0.18 | −0.10 | 1.00 | |||||
| (17) ln(1+ Article impact) | 0.13 | 0.25 | 0.49 | 0.16 | −0.29 | 0.21 | 0.02 | 0.16 | 1.00 | ||||
| (18) Total usage | −0.15 | −0.12 | −0.30 | −0.16 | 0.49 | −0.26 | −0.25 | −0.18 | −0.14 | 1.00 | |||
| (19) Internationally focused | −0.06 | −0.01 | 0.04 | −0.07 | 0.04 | −0.01 | −0.11 | 0.09 | 0.09 | 0.14 | 1.00 | ||
| (20) Asia-focused | −0.01 | 0.03 | −0.05 | −0.16 | −0.03 | −0.02 | −0.10 | 0.26 | 0.05 | −0.16 | 0.19 | 1.00 | |
| (21) Special issue | −0.12 | 0.19 | 0.15 | −0.01 | 0.01 | −0.01 | −0.09 | 0.12 | 0.34 | −0.13 | 0.24 | 0.10 | 1.00 |
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