新手小白请教各位大神：我需要对每一年设置虚拟变量，但是貌似出来的结果是对每一天设置虚拟变量，做固定效应分析时出现了很多次多重共线性，不太明白该怎么改，网上也没找到相关结果，可能是我搜索方法不对，请各位大神指教！谢谢！

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