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第7行： − − Stratified randomization is extremely useful when the target population is [[Homogeneity and heterogeneity|heterogeneous]] and effectively displays how the trends or characteristics under study differ between strata.<ref name=":3" /> When performing a stratified randomization, the following 8 steps should be taken:<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> − −
→分层随机试验步骤
== 分层随机试验步骤 ==
== 分层随机试验步骤 ==
分层随机化在目标总体异<font color="#ff8000"> '''质性
分层随机化在目标总体异<font color="#ff8000"> '''质性