有序变量(ordinal variable)：也称为等级变量， 将观察单位按某种属性的不同程度分组，然后清点 各组数目，但所分各组之间有等级顺序。
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有序分类变量 ordinal categorical variable ; ordered categorical variable
Ordered categorical variables means the response variables that has more than three categories between which are ordered.
多分类有序变量是指分类数大于等于3,且类别之间存在序次关系的响应变量。
参考来源 - 多分类有序变量间距差异的统计分析与实际应用·2,447,543篇论文数据，部分数据来源于NoteExpress
本文就含有序变量的三维列联表的几种情况作了讨论。
Certain cases in the use of three-dimensional contingency table with ordered variables are discussed in this paper.
从矿床密集区的统计分析，它们是矿床集合与控矿地质体集合上升有序变量关系。
According to statistical analysis of deposit concentration areas, they show ordered variable relationship between assemblages of ore deposits and associations of ore-controlling geological bodies.
注意编写7个不等式作为5个不必有序的决策变量的和太过繁琐了，因为在某些约束中，索引可能会覆盖索引值7。
Note that it would be too boring to write seven inequalities as a sum of five decision variables that are not necessarily in order, because in some constraints, the index may overlap the index 7.
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