stata中levpet lny, free(lnl) proxy(lnm) capital(lnk)显示no observation

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. gen Y = income/ 10000
(145 missing values generated)

. gen K=fixedassets/10000
(1 missing value generated)

. gen L=payemployeecash/10000
(1 missing value generated)

. gen M=mediafee/10000

. gen lnY = ln(Y + 1)
(146 missing values generated)

. gen lnL = ln(L + 1)
(1 missing value generated)

. gen lnM = ln(M + 1)
(25 missing values generated)

. gen lnK = ln(K + 1)
(1 missing value generated)

. foreach i in lnY lnL lnM lnK {
  2.     drop if `i' == .
  3.     cap drop TFP_* _TFP*
  4. }
(146 observations deleted)
(1 observation deleted)
(24 observations deleted)
(1 observation deleted)


. xtset symbol enddate
       panel variable:  symbol (unbalanced)
        time variable:  enddate, 20071231 to 20191231, but with gaps
                delta:  1 unit

. levpet lnY, free(lnL) proxy(lnM) capital(lnK)
no observations

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关键词：observation observat Capital capita levpet

普通最小二乘法和固定效应法都能测出来tfp，就lp法出错为什么啊

lp法要求时间只能有年份，不能有月和日，解决掉了