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The Directional Random Effect Model (DREM) is defined.
定义了方向随机效果模型（DREM）。
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LM test proves the random effect model is superior to the fixed effect model.
LM检验证明随机效应模型优于固定效应模型。
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LM test proves the random effect model is superior to the fixed effect model.
LM检验证明随机效应模型优于固定效应模型。
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