抽样的方式可以分为概率抽样和非概率抽样两种，概率抽样（Probability Sampling）是随机的抽样，按一定的概率以随机原则抽取样本，每个单位被抽中的概率是已知的，或是可以计算出来的。
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... probability distribution概率分布 probability sampling概率抽样法 probable event可能发生事项 ...
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non-probability sampling [数] 非概率抽样 ; 非随机抽样 ; 非机率抽样法
non-equal probability sampling 不等概采样
Area Probability Sampling 区域机率抽样
equal probability sampling 等概率抽样
stratified probability sampling 分层概率抽样
alternative to probability sampling [统计] 概率抽样的备择方案
simple probability sampling 简单随机抽样
It may determine whether one should choose nonprobability sampling or probability sampling.
它可以决定一个人应该选择非概率抽样还是概率抽样。
The result showed that the root-mean-square of Phase function fitted by random probability sampling method is smaller.
结果显示随机概率抽样方法拟合的相函数与散射相函数间的方均根差更小。
Fixed probability sampling is the simplest technique for detecting bigger traffic flows while discarding the smaller ones which consist almost more than 80% of the count of whole traffic flows.
最简单的固定概率采样能监测较大业务流，但往往忽略掉比例几乎超过80%的较小业务流。
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