ybeibei 发表于 2018-12-13 11:36 
明白了,谢谢了
请问一下,我用frontier做到第二阶段,请问结果怎么看啊,我有三个环境变量
the ols estimates are :
coefficient standard-error t-ratio
beta 0 -0.75227604E+02 0.10332943E+04 -0.72803659E-01
beta 1 0.55499800E+01 0.19205192E+02 0.28898331E+00
beta 2 -0.20898877E+01 0.20078188E+03 -0.10408746E-01
beta 3 0.20881327E+02 0.15628003E+03 0.13361481E+00
sigma-squared 0.17133470E+03
log likelihood function = -0.41412310E+02
the estimates after the grid search were :
beta 0 -0.73334280E+02
beta 1 0.55499800E+01
beta 2 -0.20898877E+01
beta 3 0.20881327E+02
sigma-squared 0.11261584E+03
gamma 0.50000000E-01
mu 0.00000000E+00
eta is restricted to be zero