广义的正交性
广义的正交性指任意两列的每一种特征号码组合都出现同样的次数,使试验点在试验范围内能均衡分散,也就是使因素的不同水平组合在因素水平的变化范围内均衡分散
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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