抽样

Methods To collect data by cluster sampling and analyze data by polychotomous Logistic regression.

方法采用整群调查搜集资料,采用多分类回归分析筛选影响因素。

It would be easy to misinterpret results from such a small sample.

从这小一出发容易得出曲解结论。

Via examining, have 40 kinds eligibly, sampling percent of pass is 58.8% , among them 10 kinds belong to the product with quality serious problem.

经检验，合格有40种，合格率为58.8%，其中有10种属质量问题严重产品。

Superpopulation model is a bridge between survey sampling and other branches of statistics.It is helpful to study sampling theory with the tool of superpopulation models.

摘要超总体模型是理论与统计学其它分支联梁，借助超总体模型研究理论是一个有前途方法。

Indicate epidemiology investigation , confirm on the grounds of international sampling investigation, major part in the cancerogenic patient who has a smoke is a passive smoker.

流行病学调查表明，据国际性调查证实，吸烟致癌患者中大部分是被动吸烟者。