Stratified sampling can reduce the sampling error associated with simplerandomsamples.
分层抽样可以减少由简单随机抽样造成的抽样误差。
2
The problem of using ordinary statistical methods basically for simplerandomsamples in analyzing data from complex surveys for non simplerandomsamples was discussed.
目前国内进行的调查大都采用复杂抽样方案,但在分析时却常常采用只适用于简单随机样本的一般方法。
3
Under simplerandom sampling scheme without replacement and unknown proportion of population possessing neutral attribute, the optimal allocation of sizes of two sub-samples is given.