回想一下,在使用虚拟变量集时,您需要省略 1 个(基线),如果固定效应集较多,您还需要省略 1 个(基数),但有时您可能需要省略更多,因为固定效应集之间存在亚组,要识别这一点并不容易。这对结果影响不大 除非您的样本很小 .Recall that when using sets of dummies you need to omit 1 (baseline) with more fix effects sets you also need to drop one (base) but some times you may need to drop more of there are subgroups across fix effect sets identifying this is not easy with more than 2 sets of fixed effects it basically means th degrees of freedom correction is slightly off it will have a minor impact on your results unleas your sample is small
回想一下,在使用虚拟变量集时,您需要省略 1 个(基线),如果固定效应集较多,您还需要省略 1 个(基数),但有时您可能需要省略更多,因为固定效应集之间存在亚组,要识别这一点并不容易。这对结果影响不大 除非您的样本很小 .Recall that when using sets of dummies you need to omit 1 (baseline) with more fix effects sets you also need to drop one (base) but some times you may need to drop more of there are subgroups across fix effect sets identifying this is not easy with more than 2 sets of fixed effects it basically means th degrees of freedom correction is slightly off it will have a minor impact on your results unleas your sample is small