用lp法求lntfp结果如下,我怎么看着这个结果有点儿不靠谱啊,结果怎么解读呢?谢谢高人指点!
Levinsohn-Petrin productivity estimator
Dependent variable represents revenue. Number of obs = 617737
Group variable (i): id Number of groups = 284653
Time variable (t): year
Obs per group: min = 1
avg = 2.2
max = 5
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lnyoutput | Coef. Std. Err. z P>|z| [95% Conf. Interval]
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lnl | .0358607 .0004751 75.48 0.000 .0349295 .0367919
lnk | 2.27e-11 .0063386 0.00 1.000 -.0124235 .0124235
lnm | .9828969 .1009439 9.74 0.000 .7850505 1.180743
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Wald test of constant returns to scale: Chi2 = 0.04 (p = 0.8429).