MEASURES OF THE VARIABILITY OF PRECIPITATION
MEASURES OF THE VARIABILITY OF PRECIPITATION
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DOI：
10.1175/1520-0493(1952)080
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发表时间：
1952-07
影响因子：
3.2
通讯作者：
R. Longley
中科院分区：
文献类型：
--
作者：
R. Longley
本文研究了四种不同的降水相对变率测量方法的实用性。结果发现，这两个措施，极端除以中位数之间的差异，是受太大的波动，在抽样是令人满意的。在这两种测量方法之间几乎没有选择，平均偏差或标准偏差除以平均值。即使采取了这些措施，波动也足够大，因此在计算之前需要30年的时间。它进一步表明，标准偏差除以平均值略有不同，平均降水量，但尽管如此，它是一个令人满意的措施，比较不同地区的降水变化。
Abstract A study is made of the usefulness of four different measures of the relative variability of precipitation. It is discovered that the two measures, the difference between the extremes divided by the median, are subject to too great fluctuations in sampling to be satisfactory. There is little to choose between the two measures, the mean deviation or the standard deviation divided by the mean. Even with these measures, the fluctuations are sufficiently large so that a period of 30 years is desirable before computing them. It is further shown that the standard deviation divided by the mean varies slightly with mean precipitation but, in spite of this, it is a satisfactory measure with which to compare variability of precipitation in different localities.