luotuoren 发表于 2012-6-2 09:29 
捣鼓出来,效率值里面有负数,怎么解释?
technical efficiency estimates :
算出来的效率也不会出现负值
CD函数
efficiency estimates for year 1 :
firm eff.-est.
1 0.83176091E+00
2 0.94718067E+00
3 0.88558251E+00
4 0.56872797E+00
5 0.59901852E+00
6 0.43793465E+00
7 0.23515756E+00
8 0.39645546E+00
9 0.31858584E+00
10 0.12509631E+00
translog
efficiency estimates for year 1 :
firm eff.-est.
1 0.96237876E+00
2 0.94557073E+00
3 0.76669382E+00
4 0.56976032E+00
5 0.78206863E+00
6 0.44708460E+00
7 0.35611451E+00
8 0.47577903E+00
9 0.42717913E+00
10 0.67802706E+00