Talk:Common cause and special cause

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In paragraph

  • "Walter A. Shewhart originally used the term chance-cause. The term common-cause was coined by Harry Alpert in 1947. Shewhart called a process that features only common-cause variation in statistical control. This term is deprecated by some modern statisticians who prefer the phrase stable and predictable."

What does the bold paragraph mean, it is missing something. -- SGBailey 12:59, 2005 Jun 9 (UTC)

The original quotes (italics)?
Walter A. Shewhart originally used the term chance-cause. The term common-cause was coined by Harry Alpert in 1947. Shewhart called a process that features only common-cause variation "in statistical control". This term is deprecated by some modern statisticians who prefer the phrase "stable and predictable".
Cutler 16:21, Jun 9, 2005 (UTC)

hey,

I think the special cause variation in this article is wrong!!

It is meant to say, that the variation CAN be attributed to a SPECIFIC cause, and is not just random vairation James

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