As well known, the loss of efficiency in est-imation and inference may be substantial if hetero-scedasticity is neglected.
熟知，如果误差同方差
能满足，利用同方差回归模型估计和推断有效性会大大降低。
As well known, the loss of efficiency in est-imation and inference may be substantial if hetero-scedasticity is neglected.
熟知，如果误差同方差能满足，利用同方差回归模型估计和推断有效性会大大降低。
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