小弟请问一下各位大神,为什么我用第二阶段的sfa调整,最后的效率值中居然有负数?这个太令我费解了!我用的是未进行对数化的值
technical efficiency estimates :
firm eff.-est.
1 -0.44805672E-01
2 -0.38665693E+00
3 0.94677598E+00
4 0.95550710E+00
5 0.92521518E+00
6 0.93811489E+00
7 0.93375573E+00
8 0.92912643E+00
9 0.10000000E+01
10 0.78679132E+00
11 0.90207412E+00
12 0.90056447E+00
13 0.81145004E+00
14 0.89887510E+00
15 0.96619156E+00
16 0.95556325E+00
17 0.94053067E+00
18 0.92836225E+00
19 0.81771601E+00
20 0.91083017E+00
21 0.75954487E+00
22 0.93912623E+00
23 0.94772814E+00
24 0.89702320E+00
25 0.90344469E+00
26 0.64874398E+00
27 0.93258778E+00
28 0.90112083E+00
29 0.83924515E+00
30 0.90117805E+00
31 0.90605928E+00
mean efficiency = 0.82554142E+00
虽然可能存在不收敛的问题,但也不至于效率值是负的吧?重来没遇见过这样的问题!另外用stata算的话,虽然效率值最后都在0-1范围内了,但是所有的效率值都是同一个数了!费解啊!真心求教,望各大神不吝赐教!等答案!先谢谢了
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