畜禽养殖废弃物资源化的纵向关系选择研究——基于北京市养殖场户视角
舒畅, 乔娟, 耿宁

The vertical relationship selection of livestock and poultry breeding waste recycling based on the perspective of farmers in Beijing
Chang SHU, Juan QIAO, Ning GENG
表2 多变量Probit方程的协方差矩阵
Table 2 The covariance matrix of multivariate Probit equation
自家还田 赠予给周边种植户 销售给周边种植户 销售给粪污经销商
赠予给周边种植户 -0.15 (-1.28) - - -
销售给周边种植户 -0.08 (-0.67) -0.37***(-3.54) - -
销售给粪污经销商 -0.16 (-1.16) -0.30** (-2.40) -0.36***(-2.86) -
Likelihood ratio test of rho21=rho31= rho41=rho32=rho42= rho43=0
chi 2(6)= 47.34 Prob>chi 2= 0.000 0
legend:* p<.1;**p<.05;*** p<.01