Methods a case was used to illustrate the identification and discrimination of experimental units and factor levels in Split-split plot design, which is the base of correct selection of ANOVA model.

方法结合实例介绍裂-裂区设计中实验单位、实验因素级别的正确识别和合理安排，以便正确选择方差分析模型。

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When Mississippi Gov. Phil Bryant signed the state's voter photo identification measure into law this month, the move harkened back to the type of discrimination Simmons' grandmother and others faced during the tumultuous civil rights era, the state legislator said.

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