- LocationId OriginalValue Mean
- 1 0.45 3.99
- 2 0.33 3.99
- 3 16.74 3.99
- 4 3.31 3.99
等等…
我将如何使用此表格制定标准偏差,以及您将推荐什么 – STDEVP或STDEV？
解决方法
- SELECT STDEVP(OriginalValue)
- FROM yourTable
从下面你可能想要STDEVP.
从here：
STDEV is used when the group of numbers being evaluated are only a partial sampling of the whole population. The denominator for dividing the sum of squared deviations is N-1,where N is the number of observations ( a count of items in the data set ). Technically,subtracting the 1 is referred to as “non-biased.”
STDEVP is used when the group of numbers being evaluated is complete – it’s the entire population of values. In this case,the 1 is NOT subtracted and the denominator for dividing the sum of squared deviations is simply N itself,the number of observations ( a count of items in the data set ). Technically,this is referred to as “biased.” Remembering that the P in STDEVP stands for “population” may be helpful. Since the data set is not a mere sample,but constituted of ALL the actual values,this standard deviation function can return a more precise result.
