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1.5 Sigma Kaymanin Ýstatistiksel Kaymasi Nedenleri Uzerine Bir Arastirma


  • Ali Riza Firuzan

    () (Dokuz Eylul University)

  • Umit Kuvvetli

    () (Dokuz Eylul University)


Six Sigma whose aim is perfect the processes was first introduced to the world by Motorola in the 1980s. Since then, those who follow the philosophy of Six Sigma has questioned why a specific shift must be added to process mean before estimating the capability of process. According to the Six Sigma literature, the value that must be added to the process mean is between 1.4 and 1.6 sigma, and generally 1.5 sigma is used for most processes. This study aims to seek answers to the questions which are why this correction is needed and why not any value but 1.5 sigma must be added to the process mean.

Suggested Citation

  • Ali Riza Firuzan & Umit Kuvvetli, 2012. "1.5 Sigma Kaymanin Ýstatistiksel Kaymasi Nedenleri Uzerine Bir Arastirma," Istanbul University Econometrics and Statistics e-Journal, Department of Econometrics, Faculty of Economics, Istanbul University, vol. 16(1), pages 1-11, May.
  • Handle: RePEc:ist:ancoec:v:16:y:2012:i:1:p:1-11

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    More about this item


    Six Sigma; 1.5 sigma shift; control charts;

    JEL classification:

    • C19 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Other


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