The research shows misuse cases of quantitative regression analysis used in QC circle activity and six sigma movement which presents guidelines of correct use for quality practitioners. Additionally, the qualitative regression analysis that responses nonconforming ratio of variable y, is reviewed based on misuse cases for proper use by practitioners in the field. In most cases, there are frequent errors that involve the correlation analysis or ANOVA, regardless of using quantitative regression analysis. In addition, qualitative regression analysis for the nonconforming ratio that has dependent variable of discrete and categorical data, is often applied with quantitative regression and result in ineffective quality improvement.

Abstract
 1. 서론
 2. 정량적 회귀분석의 특징 및 오적용
  2.1 정량적 회귀분석의 종류 및 검추정
  2.2 정량적 회귀분석의 오적용
 3. 정성적 회귀분석의 이해와 오적용
  3.1 정성적 회귀분석의 이해
  3.2 정성적 회귀분석의 오적용
 4. 결론
 5. 참고문헌

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