We develop imputation estimators of mean of responses for semiparametric varying-coefficient model with response variables missing at random.
在响应变量随机缺失时，研究了半参数变系数模型响应变量均值的借补估计。
It is very important to divide the missing data into three manners: missing at random (MAR), missing not at random (MNAR) and missing completely at random (MCAR).
将数据缺失方式划分为随机缺失，非随机缺失与完全随机缺失，这对于合理编写缺失数据推估程序，正确选用估算方法有很重要的意义。
The machine fixes the length at random, and has accurate and stable photoelectric tracking. If any missing bags, it will stop running automatically.
任意定长，步长光电跟踪，平稳，丢标三个袋子以上自动停机。
The machine fixes the length at random, and has accurate and stable photoelectric tracking. If any missing bags, it will stop running automatically.
任意定长，步长光电跟踪，平稳，丢标三个袋子以上自动停机。
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