[img]file:///C:/Documents%20and%20Settings/Administrator/Application%20Data/Tencent/Users/80747112/QQ/WinTemp/RichOle/0RRIKA9[Y`LYAK`SNQ_O00A.jpg[/img]
用的固定效应模型，这是结果，不确定是否正确，希望各位能给予指正