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add tail control tolerance limits to JMP

Status: New Submitted by on ‎03-14-2022 12:33 PM
Comment

For 2-sided normal theory tolerance limits there are two approaches based on content:

  1. assure that the interval covers at least p proportion of the population with specified confidence
  2. assure that the interval covers no more than (1-p)/2 from each tail of the population

(cf. Hahn and Meeker [1991, 2017] or Krishnamoorthy and Mathew [2009]). The second approach (introduced by Owen, 1964) is more stringent, producing wider intervals, but directly related to an exact lower confidence bound for process capability index Cpk (cf. Chou, Owen, & Borrego, 1990). Currently, JMP only offers the 1st type. Please add the 2nd type as an option.