Measuring the dispersion: the dispersion gives us a measure of the range, or spread of data within a given dataset.
度量分散情况：分散情况向我们提供了范围，或者给定数据集内数据扩散情况的度量手段。
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We also need some measure of — we've been talking here about measures of central tendency only and in finance we need, as well, measures of dispersion, which is how much something varies.
We also need some measure of--We've been talking here about measures of central tendency only and in finance we need, as well, measures of dispersion, which is how much something varies.