With different tracers, they are equivalent only in the number of grain, but not equivalent in the samplingprobability.
对不同的示踪剂，仅在颗粒数量上等效，在抽样概率上是不等效的。
2
It may determine whether one should choose nonprobability sampling or probabilitysampling.
它可以决定一个人应该选择非概率抽样还是概率抽样。
3
The simulation is categorized as a sampling method because the inputs are randomly generated from a probability distribution that stands in for a real data population.