We consider a mixed model with covariates considered as fixed effects and a random factor. In this paper, we consider methods for constructing confidence intervals on measures of variability in repeatability and reproducibility study to the mixed model with fixed effects and random effects. Computer simulation is used to determine how well confidence intervals maintain the stated confidence level and compare confidence interval lengths for the methods. A numerical example is considered to illustrate the confidence intervals proposed.

Abstract
 1. 서론
 2. 2개의 오차항을 갖는 혼합모형의 특성
 3. 모수들의 신뢰구간
  3.1 수정 대표본 방법
  3.2 잔차 최대 우도 방법
 4. 결론
 참고문헌

• 박동준(부경대학교 수리과학부)
• 강인선(전주대학교 생산디자인공학)