但是当我增加了一个变量后:结果却变成了这样
Pooled model with spatially lagged dependent variable, spatial and time period fixed effects
R-squared = 0.9735
corr-squared = 0.0183
sigma^2 = 0.0230
Nobs,Nvar,#FE = 150, 5, 38
log-likelihood = 89.163887
# of iterations = 1
min and max rho = -1.6037, 1.0000
total time in secs = 0.0310
time for optimiz = 0.0000
time for eigs = 0.0150
No lndet approximation used
***************************************************************
Variable Coefficient Asymptot t-stat z-probability
variable 1 0.078745 0.414945 0.678182
variable 2 0.104030 1.367919 0.171337
variable 3 -0.180449 -0.413485 0.679251
variable 4 0.063681 0.428037 0.668624
W*dep.var. -0.079761 -0.696265 0.486263