碳约束下中国县域尺度农业全要素生产率比较研究
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揭懋汕, 郭洁, 陈罗烨, 雪燕, 薛领
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Spatial and temporal changes of total factor productivity in agriculture: A stochastic frontier analysis of China at county level, 1991-2011
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Maoshan JIE, Jie GUO, Luoye CHEN, Yan XUE, Ling XUE
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表5 SFA模型变量影响系数估计结果 |
Tab.5 Estimated results of variable influencing coefficients of SFA model |
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变量 | 模型一(不含碳) | 模型二(含碳) | t | 0.0324861*** | 0.0325817*** | ln_labor | 0.4721839*** | 0.3307102*** | ln_sow | 0.2651815*** | 0.2573986*** | ln_mach | 0.0184332 | -0.0107921 | ln_fert | 0.1207823*** | 0.4081773*** | ln_carb | n/a | -0.2486651*** | t2 | -0.0018517*** | -0.000753*** | ln_labor2 | 0.0191562*** | 0.021111*** | ln_sow2 | 0.0369929*** | 0.0231771*** | ln_mach2 | 0.011475*** | 0.0107546*** | ln_fert2 | 0.0206027*** | 0.0055238*** | ln_carb2 | n/a | 0.0128299*** | ln_ls | -0.0499344*** | -0.0526316*** | ln_lm | -0.0145748*** | -0.0199142*** | ln_lf | -0.0052396* | -0.0153826*** | ln_lc | n/a | 0.0276511*** | ln_sm | -0.0061255** | -0.00106 | ln_sf | -0.0233424*** | 0.0065757*** | ln_sc | n/a | -0.0049919* | ln_mf | 0.0010222 | -0.0032592** | ln_mc | n/a | 0.0097969*** | ln_fc | n/a | -0.0247946*** | tln_labor | 0.0011279*** | 0.0031423*** | tln_sow | 0.0036057*** | 0.0012476*** | tln_mach | 0.0014285*** | 0.0003381 | tln_fert | 0.0003411 | 0.0007519** | tln_carb | 0.0011279*** | -0.0021669*** | _cons | 4.20643*** | 5.691403*** | mu | 2.628428*** | 3.114244*** | eta | -0.0067637*** | -0.0041398*** | lnsigma2 | -0.9874583*** | -0.9293078*** | ilgtgamma | 0.6267092*** | 1.233698*** | sigma2 | 0.3725223 | 0.3948269 | gamma | 0.7636884 | 0.7744651 | sigma_u2 | 0.2427888 | 0.3057797 | sigma_v2 | 0.1297335 | 0.0890472 | Log likelihood | -21917.915 | -15995.984 | Prob>chi2 | 0.0000 | 0.0000 |
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