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Normality in Quality Control Charts
Author(s) -
Moore Peter G.
Publication year - 1957
Publication title -
journal of the royal statistical society: series c (applied statistics)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.205
H-Index - 72
eISSN - 1467-9876
pISSN - 0035-9254
DOI - 10.2307/2985602
Subject(s) - normality , control chart , statistics , shewhart individuals control chart , computer science , mathematics , ewma chart , process (computing) , operating system
The assumption of normality in the interpretation of quality control charts may be accepted uncritically by some and viewed with scepticism by others. In this article Dr Moore shows how certain departures from normality can affect the probabilities associated with control limits calculated by normal theory. These examples should serve as a warning against the too rigid interpretation of such control limits.