In general, children with low birth weight had poorer lung function, appetite and motor function than normal birth-weight children, as well as being more anxious, less positive and less lively.

一般说来，极低出生体重儿与正常儿相比，肺功能，食欲及运动功能都要差，也更多见焦虑，不象正常儿一样积极，活泼。

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When multiple outliers occur in linear regression model or the distribution of residuals is not normal, we can use residuals rank as weight function to get some resist estimator.

线性回归模型的误差项不服从正态分布或存在多个离群点时，可以将残差秩次的某些函数作为权重引入估计模型来减少离群点的不良影响。

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The equivalent weight function in robust estimation is usually constructed by the statistics of normal distribution. The critical values are often fixed by experience.

抗差估计等价权函数一般由正态分布统计量构造，其临界值（或称准则）一般由实际经验确定。

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