Table 4. Fixed Effects Poisson Models with Original Interdisciplinarity Measures (N = 646223).
| Long-term citations (13-year) | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | (14) | |
| ln(authors) | 0.16*** | 0.16*** | 0.16*** | 0.16*** | 0.16*** | 0.16*** | 0.16*** | 0.16*** | 0.16*** | 0.16*** | 0.16*** | 0.16*** | 0.16*** | 0.16*** |
| (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | |
| International | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | |
| ln(pages) | 0.40*** | 0.40*** | 0.40*** | 0.40*** | 0.40*** | 0.40*** | 0.41*** | 0.41*** | 0.41*** | 0.41*** | 0.40*** | 0.40*** | 0.40*** | 0.40*** |
| (0.03) | (0.03) | (0.03) | (0.03) | (0.03) | (0.03) | (0.03) | (0.03) | (0.03) | (0.03) | (0.03) | (0.03) | (0.03) | (0.03) | |
| ln(refs) | 0.27*** | 0.27*** | 0.31*** | 0.30*** | 0.31*** | 0.31*** | 0.30*** | 0.30*** | 0.29*** | 0.29*** | 0.30*** | 0.30*** | 0.30*** | 0.30*** |
| (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | (0.01) | |
| ln(referenced SCs) | 0.08*** | -0.01 | ||||||||||||
| (0.01) | (0.04) | |||||||||||||
| (ln(referenced SCs))2 | 0.02* | |||||||||||||
| (0.01) | ||||||||||||||
| Ratio oth-disc refs | -0.08*** | 0.32*** | ||||||||||||
| (0.02) | (0.05) | |||||||||||||
| (Ratio oth-disc refs)2 | -0.40*** | |||||||||||||
| (0.04) | ||||||||||||||
| 1-Gini | 0.01 | 0.03 | ||||||||||||
| (0.03) | (0.17) | |||||||||||||
| (1-Gini)2 | -0.01 | |||||||||||||
| (0.12) | ||||||||||||||
| Simpson | 0.18*** | -0.30* | ||||||||||||
| (0.04) | (0.12) | |||||||||||||
| Simpson2 | 0.40*** | |||||||||||||
| (0.11) | ||||||||||||||
| Shannon | 0.07*** | 0.00 | ||||||||||||
| (0.01) | (0.03) | |||||||||||||
| Shannon2 | 0.02 + | |||||||||||||
| (0.01) | ||||||||||||||
| Avg dissimilarity | 0.43*** | 1.02** | ||||||||||||
| (0.07) | (0.35) | |||||||||||||
| (Avg dissimilarity)2 | -0.41 | |||||||||||||
| (0.25) | ||||||||||||||
| Rao-Stirling | 0.58*** | 0.65* | ||||||||||||
| (0.08) | (0.29) | |||||||||||||
| (Rao-Stirling)2 | -0.16 | |||||||||||||
| (0.57) | ||||||||||||||
| Journal fixed effects | YES | YES | YES | YES | YES | YES | YES | YES | YES | YES | YES | YES | YES | YES |
| Log pseudolikelihood | -8637695 | -8637136 | -8641587 | -8635054 | -8644074 | -8644073 | -8640234 | -8639142 | -8638382 | -8638061 | -8635233 | -8635032 | -8635015 | -8635008 |
| χ 2 | 3098*** | 3228*** | 3001*** | 3698*** | 2941*** | 3174*** | 3005*** | 3092*** | 3050*** | 3053*** | 4083*** | 4066*** | 3903*** | 4175*** |
Cluster-robust standard errors in parentheses.
*** p<.001
** p<.01
* p<.05
+ p<.10.
Data sourced from Thomson Reuters Web of Science Core Collection.