品质协会 发表于 2017-8-4 19:38:14

Minitab里Pooled standard deviation(合并标准差)的计算公式和解释

Pooled standard deviation(合并标准差) is a way to find a better estimate of the true standard deviation given several different samples taken in different circumstances where the mean may vary between samples but the true standard deviation (precision) is assumed to remain the same. It is calculated by Pooled standard deviation.


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 calculating standard deviations from samples.


品质协会 发表于 2017-8-4 19:56:08

4种标准差σ的计算方法：简易标准差,Rbar/d2，Sbar/C4和Minitab中的Pooled standard deviation(合并标准差)

http://www.pinzhi.org/forum.php?mod=viewthread&tid=576

叶平 发表于 2017-8-7 10:21:09

谢谢分享。。。

hhtb527 发表于 2017-8-21 10:15:46

谢谢分享

Alina02 发表于 2017-8-30 16:54:58

thanks

hjs213 发表于 2017-10-27 19:26:38

牛逼

ice753 发表于 2017-11-12 12:01:14

谢谢分享

吉梨苹果 发表于 2017-11-14 12:06:42

:lol

生如夏花 发表于 2017-11-16 11:27:54

看着好难呀！:(

huanglake 发表于 2017-12-4 08:48:36

:@
页: [1] 2 3
查看完整版本: Minitab里Pooled standard deviation(合并标准差)的计算公式和解释