在空间滞后回归中出现如下问题，原方程自变量4个，因变量1个
但回归结果有的显示5个变量，有的显示三个变量，因为是初学matlab，所以实在搞不清楚了，恳请帮忙解释，谢谢
回归结果如下：
Pooled model with spatially lagged dependent variable, no fixed effects
**************************************************************
Variable Coefficient Asymptot t-stat z-probability
variable 1 308.303211 9.078172 0.000000
variable 2 -0.000010 -7.775894 0.000000
variable 3 0.000267 4.338540 0.000014
variable 4 0.000033 7.965784 0.000000
variable 5 0.000004 1.556339 0.119627
W*dep.var. 0.268948 5.909426 0.000000
Pooled model with spatially lagged dependent variable and spatial fixed effects
Variable Coefficient Asymptot t-stat z-probability
constant -0.000011 -8.377766 0.000000
x1 0.000256 4.261714 0.000020
x2 0.000031 7.858592 0.000000
x3 0.000004 1.673782 0.094174
W*dep.var. 0.281977 6.315163 0.000000
Pooled model with spatially lagged dependent variable and time period fixed effects
***************************************************************
Variable Coefficient Asymptot t-stat z-probability
constant -0.000007 -6.292924 0.000000
x1 0.000203 3.254934 0.001134
x2 0.000042 9.249307 0.000000
x3 0.000002 1.017103 0.309104
W*dep.var. 0.320951 8.540249 0.000000
Pooled model with spatially lagged dependent variable, spatial and time period fixed effects
***************************************************************
Variable Coefficient Asymptot t-stat z-probability
constant -0.000008 -6.894750 0.000000
x1 0.000205 3.303006 0.000957
x2 0.000041 9.017151 0.000000
x3 0.000002 0.945005 0.344656
W*dep.var. 0.315997 8.479627 0.000000
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