random sampling error
随机抽样误差 random sampling error ; [数] error of random sampling
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结论：推导并建立多重分层、整群随机抽样误差的计算公式。
CONCL USION: the calculation formulas of multiple - stratifying and clustering random sampling are theoretically set up.
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分层抽样可以减少由简单随机抽样造成的抽样误差。
Stratified sampling can reduce the sampling error associated with simple random samples.
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