集中趋势的量度（measures of central tendency):共性 离散程度的量度(measures of variability)：异质性 例子 集中趋势的量度 集中趋势(平均数值)是对整个群体的数值的最好的代表。
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We can calculate our measures of variability equally well for individual securities and portfolios of securities.
我们能够同样好的对个别证券和证券组合计算变异性的衡量标准。
MAIN OUTCOME MEASURES: Intrasession and intersession coefficient of variation, intraclass correlation coefficient, intratest variability, and test-retest variability.
主要观察指标：期间和期间内的变异系数、组内相关系数、测试间变异性和测试-再测试结果的变异性。
In a study of young children, researchers showed that insomnia symptoms were consistently associated with impaired heart variability measures.
在这项针对幼儿的研究中，研究者发现失眠症与心率变异性受损密切相关。
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