# pooled standard deviation 中文 pooled

pooled standard deviation

## 標準差σ的種計算公式_百度文庫

It is calculated by where sp is the pooled standard deviation， ni is the sample size of the i’th sample， si is the standard deviation of the i’th sample， and k is the number of samples being combined. n?1 is used instead of n for the same reason it may be used in

In the dice example the standard deviation is √2.9 ≈ 1.7， slightly larger than the expected absolute deviation of 1.5. The standard deviation and the expected absolute deviation can both be used as an indicator of the “spread” of a distribution.

Pooled Standard Deviation Definition
Pooled standard deviation is the standard deviation remaining after removing the effect of special cause variation-such as geographic location or time of year. It is the average variation of your subgroups.

## East Carolina University

East Carolina University

IUPAC
24/2/2014 · A problem often arises when the combination of several series of measurements performed under similar conditions is desired to achieve an improved estimate of the imprecision of the process. If it can be assumed that all the series are of the same @P04799