gen Indcd=1 if  strmatch(  Industry,"A")
          replace Indcd=2 if  strmatch(  Industry,"B")
          replace Indcd=3 if  strmatch(  Industry,"C0")
          replace Indcd=4 if  strmatch(  Industry,"C1")
          replace Indcd=5 if  strmatch(  Industry,"C2")
          replace Indcd=6 if  strmatch(  Industry,"C3")
          replace Indcd=7 if  strmatch(  Industry,"C4")
          replace Indcd=8 if  strmatch(  Industry,"C5")
          replace Indcd=9 if  strmatch(  Industry,"C6")
          replace Indcd=10 if  strmatch(  Industry,"C7")
          replace Indcd=11 if  strmatch(  Industry,"C8")
          replace Indcd=12 if  strmatch(  Industry,"C9")
          replace Indcd=13 if  strmatch(  Industry,"D")
          replace Indcd=14 if  strmatch(  Industry,"E")
          replace Indcd=15 if  strmatch(  Industry,"F")
          replace Indcd=16 if  strmatch(  Industry,"G")
          replace Indcd=17 if  strmatch(  Industry,"H")
          replace Indcd=18 if  strmatch(  Industry,"J")
          replace Indcd=19 if  strmatch(  Industry,"K")
          replace Indcd=20 if  strmatch(  Industry,"L")
          replace Indcd=21 if  strmatch(  Industry,"M")
          
          gen inv=.
forvalues i=2008/2012 {
    forvalues j=1/21 {
  reg NewInvt TobinQ AReturn Cash Age  LagInvest SIZE LEV,if year=='i' & Indcd=='j'
    predict e,resid
    replace inv=e if year=='i' & Indcd=='j'
            drop e
         }
         }
循环的时候现实“option if not allowed”
哪里出问题了啊？