大家在查： intersessional 桴鼓相应 Linsi foundationsthe Yamuna River C70 杰里兹 prorogue Bajie kuitin

样本例

样本例

样本例

样本例

1

Objective Explore the method for the estimation of sample size in two stage cluster randomization tirals.

目的探讨两阶段整群随机化设计两组比较样本例数估计方法。

2

Methods According to the design effect and the number of cluster to estimate the sample size .

方法通过估计组内相关系数，根据设计效应及群的大小估计样本例数。

3

Methods The results of some blood samples detected with ELISA, RPR, TRUST and TPPA were compared and analysed .

方法以梅毒 ELISA 法检测技术与 RPR 、TRUST 及 TPPA 法对若干样本例检测结果进行对比分析。

4

percentage of total sum , percentage of total N

总和的百分比，样本例数的百分比和的百分比，

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