• Communications for Statistical Applications and Methods
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• 제15권6호
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• pp.947-957
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• 2008

In this paper, we consider the c-sample location problem for ordered alternatives using median ranked ordering-set samples(MROSS). We propose the test statistic using the median of samples that have the same ranked order in each cycle of ranted ordering-set sample(ROSS). We obtain the asymptotic property of the proposed test statistic and Pitman efficiency with respect to other test statistic. In simulation study, our proposed test statistic has good powers for some underlying distributions we consider.

• Communications for Statistical Applications and Methods
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• 제7권2호
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• pp.447-456
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• 2000

In this paper, we considered three methods for outlier identification sample surveys. First, we studied method of handling and adjusting outliers in normal population. Second, we studied existing methods using mean, maximum and minimum and proposed a test using of median which well reflects characteristic of data regardless of sampling distribution. Finally, we showed our test using median works better than Dixon and mean test through simulation.

• Journal of the Korean Data and Information Science Society
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• 제15권4호
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• pp.973-980
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• 2004

Phase I clinical trials are often pharmacologically oriented and usually attempt to find the best dose of drug to employ. However, other purposes like determination of sizes and types of side effects and toxicity and organ system involved are equally important. Estimation of treatment effects or side effects is usually ignored since it is usually based on too small sample, even though Phase II clinical trials would be designed based on the Phase I studies. Statistical methods for constructing the approximate confidence interval for population median in case of small sample are considered and an improved method is proposed. The proposed estimator is compared with current methods through simulation studies.

• Fibers and Polymers
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• 제6권4호
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• pp.332-335
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• 2005

The fibrogram theory is newly derived from the superposition principle of the conventional staple diagram, in which the left-hand ends of the fibers have to share a common starting point in order for the fiber length distribution to be measured, and the right-hand ends of the fibers form points. It is shown that the fibrogram is the staple diagram of the fiber sample having different random starting points, as well as the double cumulative distribution function of the frequency length function in the length biased sample. Also, the various means, viz. the numerical mean length, numerical mean length in median, length biased mean length, and length biased mean length in median, and the various upper half means, viz. the numerical upper half mean length, numerical upper half mean length in median, length biased upper half mean length, and length biased upper half mean length in median, are discussed in relation to the cotton blending process.

• 품질경영학회지
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• 제14권2호
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• pp.2-8
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• 1986

This thesis is concerned with the design of control chart based on the sample median which is easy to use in practical situations and to analyze the properties for non-normally distributed Weibull process. In this cases are use to the quality characteristics of the process are not normally distributed but skewed due to the intermitted production, small lot size and sample size is small one n=3 or n=5, etc. And when it relates unsymmetrically distributed process, model designed median control chart is more effective than Shewhart $\bar{x}$-chart which assumed on normal distribution, when we exactly should be known Weibull distribution or estimated. The median control chart in this thesis is more robustness compared with other conventionally developed control chart.

• 한국컴퓨터정보학회논문지
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• 제11권4호
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• pp.9-15
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• 2006

본 논문에서는 잡음영상에서 효과적인 에지검출을 위해 이표본 위치문제(two-sample location Problem)에서 잘 알려진 선형 순위 검정법(linear raft test)인 Wilcoxon 검정법, Median 검정법 그리고 Van der Waerden 검정법을 적용하고자 한다. 에지 존재 유무는 에지-높이 모수(edge-height parameter)를 사용한 모형 하에서 인접한 두 개의 근방영역간의 평균 차이를 검정함으로서 통계적으로 결정한다. 여기서 근방영역의 크기와 형태는 에지검출을 위한 계산 속도와 에지방향을 고려하여 적응성 있게(adaptively) 결정하였다. 통계적 방법들의 에지검출 성능을 평가하기 위해 자연영상(natural images)과 인조영상(synthetic images) 그리고 잡음이 추가된 영상에 대해 실험을 실시하고 비교 분석하였다.

• Journal of the Korean Statistical Society
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• 제9권2호
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• pp.181-193
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• 1980

A class of nonparametric estimators of the ratio of scale parameters is proposed. The estimators are based on the distribution-free rank-like test suggested by Fligner and Killeen (1976). An explicit form of the estimator is the median of the ratios of absolute deviations from the combined sample median. A small-sample Monte Carlo study shows that the proposed estimator is more efficient than the Bhattacharyya (1977) estimator. The proposed estimator is is reasonably insensitive to small failures in the assumption of equal medians. A modified estimator is also considered when the meidans are unequal.

• 한국통신학회논문지
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• 제23권6호
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• pp.1454-1460
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• 1998

이 논문에서는 중앙값을 움직인 부호를 바탕으로 한 검파기를 제안하고 그 점근 성능과 우한 표본 성능을 살펴본다. 이 검파기를 중앙값을 움직인 부호 검파기라 부르는데, 이는 고전적인 부호 검파기를 확장한 것이다. 먼저, 점근 최적 이동 중앙값들과 그들의 특성을 알아보고, 이 검파기의 점근 상대효율을 생각해 본다. 확률밀도함수를 알고 있는 잡음환경에서 알려진 신호를 검파하는 문제와 분포를 거의 알 수 없는 잡음에서 알려진 신호를 검파하는 문제를 다룬다.

• Communications for Statistical Applications and Methods
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• 제24권3호
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• pp.255-269
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• 2017

This article explores the analysis of longitudinal surveys in which same units are investigated on several occasions. Multivariate exponential ratio type estimator has been proposed for the estimation of the finite population median at the current occasion in two occasion longitudinal surveys. Information on several additional auxiliary variables, which are stable over time and readily available on both the occasions, has been utilized. Properties of the proposed multivariate estimator, including the optimum replacement strategy, are presented. The proposed multivariate estimator is compared with the sample median estimator when there is no matching from a previous occasion and with the exponential ratio type estimator in successive sampling when information is available on only one additional auxiliary variable. The merits of the proposed estimator are justified by empirical interpretations and validated by a simulation study with the help of some natural populations.

• Communications for Statistical Applications and Methods
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• 제9권1호
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• pp.261-270
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• 2002

In this paper, we demonstrate the more accurate confidence intervals for median survival time under the simple proportional hazard model of Koziol and Green (1976) via the Edgeworth expansion for the distribution of the studentized ACL estimator derived in Jeong (2000). The numerical results show that the intervals, so-called test-based and reflect intervals (Slud et al., 1984), outperform normal approximating method in the small sample sizes and/or heavy censoring.