Journal of the Korea Safety Management & Science (대한안전경영과학회지)

Korea Safety Management & Science (대한안전경영과학회)
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Concept and Type for Degree of Freedom in Quality Statistics

품질통계에서 자유도 개념 및 유형

  • Published : 2007.12.30
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Abstract

This paper presents real examples of quality statistics for users to easily understand the concept and purpose for obtaining the degree of freedom. Moreover degree of freedom by Satterwaite can be used for linear combinations of unbiased variance. Finally effective degree of freedom by Welch-Satterthwaite is applicable to obtain expanded uncertainty considering type A and type B uncertainty.

Keywords

References

  1. KSA 3000 : 2005, 측정결과의 불확도 추정 및 표현을 위한 지침, 한국표준협회, 2005
  2. Satterthwaite F.E., 'An Approximate Distribution of Estimates of Variance Componests', Biometric Bulletin, 2(6) (1946) : 110 - 114 https://doi.org/10.2307/3002019
  3. Welch B.L, 'The Generalization of Students Problem When Several Different Population Variances Are Involved', Biometrika, 34(112) (1947) : 28 - 35
  4. http://en.wikipedia.org