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( Sung Hoon Hong ),( Seok Ju Llee ),( Hyuck Moo Kwon ),( Min Koo Lee ) 한국품질경영학회 2014 한국품질경영학회 학술대회 Vol.2014 No.2
The sigma level is a performance metric that indicates how often defects are likely to occur in the business process. The higher the sigma level, the less likely a process will produce defects. In this paper, the concept of sigma level is introduced and methods of calculating sigma levels for different data types are illustrated with several examples. Four data types are considered; defects data, defective items data, normally distributed variables data, and non-normally distributed data including lifetime data. MINITAB software is used for calculating the sigma levels.