Another coding error exists: M21 defines leads and lags using Stata's _n operator, which references observation numbers. With an unbalanced panel, the prior observation does not correspond to the prior year. (Panel operators L. and F. should be used.) Correcting the code renders the estimate insignificant.
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个人很惊讶这个数字如此低，本以为会有开发者拥有数百个扩展！
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