但是某些物品却比较特殊，它们具有同质性，以至于一件这样的物品无法和另一件同类物品区分开来。
Some goods, however, are of a special nature. They are homogeneous, so that no one unit can be distinguished from another.
“我们希望选取那些容易比较业务绩效的企业，且组织内部的人员所从事的工作具有同质性，”格兰特表示。
"We wanted to study an organization where we could actually see differences in performance, and where people were generally doing the same work," Grant notes.
随机效应分析被用作比较体现出异质性的试验，而固定效应方向则用来比较体现出同质性的试验。
Random-effects analysis was used for comparing trials showing heterogeneity, and fixed-effects analysis was used for comparing trials showing homogeneity.
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