用Levinsohn-Petrin方法估计TFP,
写出命令levpet lnrev,free(lnl) proxy(lnm) capital(lnk) revenue reps(250)后,
出现Insufficient variation to identify the capital and intermediate input
coefficients separately. Bootstrapping for first-stage parameters only.
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结果只能得出lnl的估计系数,lnk和lnm均得不出,请教各位大牛这是出了什么问题
不胜感激


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