当样本量较大时，QIF方法表明工作相关阵的选择等价于无偏估计方程的选择。
When the sample size is great, QIF approach shows that the selection of working correlation is same to the selection of unbiased estimating equation.
介绍了代表性校正集样本的选择、 统计学方法校正模型建立等近红外光谱的工作原理，以及利用近红外光谱进行材料鉴别和定性、 定量分析方法。
The main principle of near-infrared spectroscopy applied in the selection of representative polypropylene pellet samples and the establishment of statistical standardization model were introduced.
为了确保公平性所选择的的人群样本全部使用现有的社会经济数据库，受访者打电话有专门经过培训的工作人员询问，并且在受访期间要求填写一份简短的问卷。
Existing socioeconomic databases were used to ensure a fair population sample. Once identified, the interviewees were telephoned and asked to complete a short questionnaire with a trained interviewer.
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