全球科研论文合作网络的结构异质性及其邻近性机理
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刘承良, 桂钦昌, 段德忠, 殷美元
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Structural heterogeneity and proximity mechanism of global scientific collaboration network based on co-authored papers
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Chengliang LIU, Qinchang GUI, Dezhong DUAN, Meiyuan YIN
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| 表5 重力模型的负二项式回归估计结果 |
| Tab. 5 Estimation results of the negative binomial spatial interaction models |
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| 模型1 | 模型2 | 模型3 | 模型4 | | 国家1发文量 | 0.0304*** | 0.0168*** | 0.0168*** | 0.0172*** | | (0.0010) | (0.0005) | (0.0005) | (0.0005) | | 国家2发文量 | 0.0129*** | 0.0072*** | 0.0072*** | 0.0071*** | | (0.0010) | (0.0003) | (0.0003) | (0.0003) | | 地理邻近性 | -0.0934*** | -0.0195*** | -0.0198*** | -0.0231*** | | (0.0050) | (0.0031) | (0.0030) | (0.0030) | | 社会邻近性 | - | 0.4950*** | 0.4843*** | 0.4777*** | | - | (0.0114) | (0.0118) | (0.0117) | | 经济邻近性 | - | - | 0.1934*** | 0.1637*** | | - | - | (0.0304) | (0.0301) | | 语言邻近性 | - | - | - | -0.6055*** | | - | - | - | (0.0437) | | 常数 | 3.5188*** | 1.7361*** | 1.6978*** | 1.8197*** | | (0.0483) | (0.0373) | (0.0371) | (0.0383) | | 样本量 | 9315 | 9315 | 9315 | 9315 | | Alpha | 2.4574 | 1.4363 | 1.4307 | 1.3952 | | Wald chi2 | 1549.80 | 3630.23 | 3928.45 | 4241.28 | | Prob>chi2 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | | Log pseudolikelihood | -41131.909 | -37827.278 | -37804.322 | -37667.596 |
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