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第12行： − 分层随机化在目标种群异质性的情况下非常有用，它能有效地显示研究的趋势或特征在不同阶层之间的差异。+ +
→分层随机试验步骤
Stratified randomization is extremely useful when the target population is heterogeneous and effectively displays how the trends or characteristics under study differ between strata.
Stratified randomization is extremely useful when the target population is heterogeneous and effectively displays how the trends or characteristics under study differ between strata.
分层随机化在目标总体异<font color="#ff8000"> '''质性
Heterogeneous'''</font>的情况下非常有用， <font color="#32cd32"> 它能有效地显示研究中的趋势或特征在不同阶层（或 地层） effectively displays how the trends or characteristics under study differ between strata.</font>之间的差异。<ref name=":3" />当进行分层随机试验时，应采取以下8个步骤：<ref name=":4">{{Cite web|url=https://www.statisticshowto.com/stratified-random-sample/|title=Stratified Random Sample: Definition, Examples|last=Stephanie|date=Dec 11, 2013|website=Statistics How To|language=en-US|access-date=2020-04-07}}</ref><ref name=":5">{{Cite web|url=https://www.questionpro.com/blog/stratified-random-sampling/|title=Stratified Random Sampling: Definition, Method and Examples|date=2018-03-13|website=QuestionPro|language=en|access-date=2020-04-07}}</ref>