pony1031 发表于 2012-5-3 14:47
删掉交乘项当然可以,就是回到Cobb-Douglas成本函数,或许这样比较容易收敛。另外建议可以使用STATA,你可 ...
这是我用简单的CD函数做的,而且只用了七年的数据,但得出的out结果成本效率值用倒数转换后怎么呈现逐年降低呢(也就是Out文件输出显示效率值都大于一且逐年递增?)不知道什么原因~~按常理应该递增才对啊~
Output from the program FRONTIER (Version 4.1c)
instruction file = cd7t.ins
data file = cd7t.dta
Error Components Frontier (see B&C 1992)
The model is a cost function
The dependent variable is logged
the ols estimates are :
coefficient standard-error t-ratio
beta 0 -0.50418858E+00 0.23530327E+00 -0.21427181E+01
beta 1 0.19592768E+00 0.32041375E-01 0.61148337E+01
beta 2 -0.19230643E-01 0.37223560E-02 -0.51662558E+01
beta 3 0.63266832E-01 0.18594949E-01 0.34023665E+01
beta 4 -0.12995194E+00 0.13131867E+00 -0.98959232E+00
beta 5 0.73685018E-01 0.35211968E-01 0.20926129E+01
beta 6 -0.17209374E+00 0.26206487E-01 -0.65668376E+01
sigma-squared 0.17749531E-01
log likelihood function = 0.70451229E+02
。。。。。。
the final mle estimates are :
coefficient standard-error t-ratio
beta 0 -0.23917774E+00 0.28472423E+00 -0.84003294E+00
beta 1 0.17784766E+00 0.28070441E-01 0.63357629E+01
beta 2 -0.18330842E-01 0.30562423E-02 -0.59978367E+01
beta 3 0.45298438E-01 0.16145730E-01 0.28055986E+01
beta 4 -0.11545765E+00 0.14424509E+00 -0.80042686E+00
beta 5 0.67015911E-01 0.35645449E-01 0.18800692E+01
beta 6 -0.12096407E+00 0.35430811E-01 -0.34140926E+01
sigma-squared 0.32542797E-01 0.14298586E-01 0.22759451E+01
gamma 0.67706691E+00 0.15165657E+00 0.44644747E+01
mu is restricted to be zero
eta -0.23401842E-01 0.68211837E-01 -0.34307596E+00
log likelihood function = 0.83383090E+02
LR test of the one-sided error = 0.25863721E+02
with number of restrictions = 2
[note that this statistic has a mixed chi-square distribution]
cost efficiency estimates :
efficiency estimates for year 1 :
firm eff.-est.
1 0.10793499E+01
2 0.11083860E+01
3 0.10159258E+01
4 0.10358532E+01
5 0.11258193E+01
6 0.10324318E+01
7 0.10865418E+01
8 0.12440379E+01
9 0.10681391E+01
10 0.11045891E+01
11 0.13301171E+01
12 0.11311601E+01
13 0.10807351E+01
14 0.12223215E+01
15 0.10689754E+01
16 0.10563249E+01
mean eff. in year 1 = 0.11119193E+01
efficiency estimates for year 2 :
firm eff.-est.
1 0.10813176E+01
2 0.11111059E+01
3 0.10163083E+01
4 0.10367249E+01
5 0.11289993E+01
6 0.10332189E+01
7 0.10886942E+01
8 0.12505049E+01
9 0.10698208E+01
10 0.11072096E+01
11 0.13391513E+01
12 0.11344824E+01
13 0.10827383E+01
14 0.12281634E+01
15 0.10706784E+01
16 0.10577079E+01
mean eff. in year 2 = 0.11148016E+01
efficiency estimates for year 3 :
firm eff.-est.
1 0.10833363E+01
2 0.11138979E+01
3 0.10167002E+01
4 0.10376184E+01
5 0.11322647E+01
6 0.10340256E+01
7 0.10909028E+01
8 0.12571608E+01
9 0.10715458E+01
10 0.11098995E+01
11 0.13484640E+01
12 0.11378942E+01
13 0.10847935E+01
14 0.12341734E+01
15 0.10724252E+01
16 0.10591262E+01
mean eff. in year 3 = 0.11177643E+01
efficiency estimates for year 4 :
firm eff.-est.
1 0.10854074E+01
2 0.11167641E+01
3 0.10171015E+01
4 0.10385343E+01
5 0.11356180E+01
6 0.10348524E+01
7 0.10931690E+01
8 0.12640119E+01
9 0.10733151E+01
10 0.11126606E+01
11 0.13580652E+01
12 0.11413982E+01
13 0.10869021E+01
14 0.12403571E+01
15 0.10742169E+01
16 0.10605805E+01
mean eff. in year 4 = 0.11208096E+01
efficiency estimates for year 5 :
firm eff.-est.
1 0.10875324E+01
2 0.11197067E+01
3 0.10175127E+01
4 0.10394731E+01
5 0.11390619E+01
6 0.10356998E+01
7 0.10954945E+01
8 0.12710648E+01
9 0.10751301E+01
10 0.11154950E+01
11 0.13679657E+01
12 0.11449973E+01
13 0.10890656E+01
14 0.12467203E+01
15 0.10760549E+01
16 0.10620720E+01
mean eff. in year 5 = 0.11239404E+01
efficiency estimates for year 6 :
firm eff.-est.
1 0.10897128E+01
2 0.11227278E+01
3 0.10179339E+01
4 0.10404353E+01
5 0.11425990E+01
6 0.10365683E+01
7 0.10978811E+01
8 0.12783265E+01
9 0.10769920E+01
10 0.11184049E+01
11 0.13781764E+01
12 0.11486942E+01
13 0.10912857E+01
14 0.12532689E+01
15 0.10779404E+01
16 0.10636016E+01
mean eff. in year 6 = 0.11271593E+01
efficiency estimates for year 7 :
firm eff.-est.
1 0.10919503E+01
2 0.11258299E+01
3 0.10183654E+01
4 0.10414218E+01
5 0.11462323E+01
6 0.10374586E+01
7 0.11003304E+01
8 0.12858043E+01
9 0.10789021E+01
10 0.11213925E+01
11 0.13887090E+01
12 0.11524921E+01
13 0.10935638E+01
14 0.12600093E+01
15 0.10798748E+01
16 0.10651704E+01
mean eff. in year 7 = 0.11304692E+01
summary of panel of observations:
(1 = observed, 0 = not observed)