# 3.6.1.量度聚合(Metric Aggregations)

计算度量这类的聚合操作是以使用一种方式或者从文档中提取需要聚合的值为基础的。这些数据不但可以从文档（使用数据属性）的属性中提取出来，也可以使用脚本生成。

数值计量聚合操作是能够产生具体的数值的一种计量聚合操作。一些聚合操作输出单个的计量数值（例如avg），并且被称作single-value numeric metric aggregation，其他产生多个计量数值（例如 stats）的称作 multi-value numeric metrics aggregation。这两种不同的聚合操作只有在桶聚合的子聚合操作中才会有不同的表现（有些桶聚合可以基于每个的数值计量来对返回的桶进行排序）。


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