方法：卡方差异检验（chi-square difference test），本文根据回答者提交答卷的时间早晚将他们区分红为两组。
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异方差检验 White Heteroskedasticity Test ; white Test ; test for heteroscedasticity
股异方差检验模型 VMRT
怀特的一般异方差检验 White General Heteroscedasticity Test
第三步，再经聚类分析将样本分群，并用方差分析检验群体之间有显著差异。
Thirdly, we grouped samples by cluster analysis, and test that there are significant differences among the groups.
通过主要性状方差分析显示差异显著，进而对主要性状的遗传参数进行了评估，并根据检验t值的显著性，进行了优良家系选择。
Variance analysis taken on major characters shows evident difference, and then assessed the genetic parameters of these characters, together with t testing, superior families were chosen in the end.
计量资料差异比较采用方差分析，组间两两比较采用Q检验。
Difference between measurement data were compared through analysis of variance and that between groups with Q test.
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