解释缺少什么被认为是实验单位，以便统计评估和比较的性能数据。

Explanation is missing what is considered as an experimental unit in order to statistically evaluate and compare the performance data.

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主成分分析是研究人员通常很有帮助那些想要隔断实验单位成为小组，这样类似的试验单元属于同一情况。

Principal components analysis is usually quite helpful to researchers who want to partition experimental units into subgroup so that similar experimental units belong to the same subgroup.

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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。

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.

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