请教，用超越对数生产函数做SFA时候，用的是Battese and Coelli(1992)模型，为啥stata和Frontier4.1的估计结果差异非常大，请高手指点，送3000论坛币，谢谢
啊！！！
（1）stata命令如下：. xtfrontierlogy logk logl logklogk logllogl logklogl tlogk tlogl t tt,tvd
（2）Frontier4.1的ins.txt文件内容是
1 1=ERROR COMPONENTS MODEL, 2=TE EFFECTS MODEL
bc92.dta.txt DATA FILE NAME
bc94.out.txt OUTPUT FILE NAME
1 1=PRODUCTION FUNCTION, 2=COST FUNCTION
y LOGGED DEPENDENT VARIABLE (Y/N)
29 NUMBER OF CROSS-SECTIONS
18 NUMBER OF TIME PERIODS
522 NUMBER OF OBSERVATIONS IN TOTAL
9 NUMBER OF REGRESSOR VARIABLES (Xs)
y MU (Y/N) [OR DELTA0 (Y/N) IF USING TE EFFECTS MODEL]
y ETA (Y/N) [OR NUMBER OF TE EFFECTS REGRESSORS (Zs)]
n STARTING VALUES (Y/N)
IF YES THEN
BETA0

BETA1 TO

BETAK



SIGMA SQUARED

GAMMA

MU
[OR DELTA0

ETA
DELTA1 TO

DELTAP]



NOTE: IF YOU ARE SUPPLYING STARTING VALUES

AND YOU HAVE RESTRICTED MU [OR DELTA0] TO BE

ZERO THEN YOU SHOULD NOT SUPPLY A STARTING

VALUE FOR THIS PARAMETER.