碳约束下中国县域尺度农业全要素生产率比较研究
揭懋汕, 郭洁, 陈罗烨, 雪燕, 薛领

Spatial and temporal changes of total factor productivity in agriculture: A stochastic frontier analysis of China at county level, 1991-2011
Maoshan JIE, Jie GUO, Luoye CHEN, Yan XUE, Ling XUE
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
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