program my1
args todo b lnfj
tempvar xb
quietly generate double ‘xb’ = ‘b’[1,1]*perdisincome + ’b’[1,2]*swc + ‘b’[1,3]
quietly replace ‘lnfj’ = ln(normalden((twtp- ‘xb’) / ‘b’[1,4]))- ln(‘b’[1,4])
end
ml model gf0 my1 (twtp=perdisincome swc)/sigma
出现错误提示:unknown method gf0
然后我又改为运行:
ml model lf my1 (twtp=perdisincome swc)/sigma
再运行
ml maximize出现提示错误:' invalid name 完成的程序应该如何写呢 (同时我想估计出sigma) 谢谢!!

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