The DO Loop

Statistical programming in SAS with an emphasis on SAS/IML programs
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Rick Wicklin 0
The three-sigma rule

A remarkable result in probability theory is the "three-sigma rule," which is a generic name for theorems that bound the probability that a univariate random variable will appear near the center of its distribution. This article discusses the familiar three-sigma rule for the normal distribution, a less-familiar rule for unimodal

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