• The Korean Journal of Applied Statistics
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• v.28 no.3
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• pp.417-427
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• 2015

Measures in response rate used to measure the representativeness of the sample (the more high response rate) better explain the representativeness of the sample. However, we cannot often explain the representativeness of the sample because there is nonresponse even in the high response rate. Therefore, Schouten et al. (2009) presented a new R-indicator measure that can be described as a representative of the sample. We research the new estimator of the R-indicator in this paper because there are parameters that require estimations. We describe the meanings as representative of the R-indicator; consequently, the bias and efficiency of the proposed estimator for R-indicator are compared to the existing estimator under various simulations. The representativeness of the sample is also explained by applying the proposed estimators in the actual data.

• Journal of the Korean Data and Information Science Society
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• v.24 no.3
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• pp.477-485
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• 2013

In this paper, we consider the sample sizes required for each group in independent two sample test of normal populations when both the type I error and type II error probabilities are specified with sample sizes and variances being possibly different. We derived the sample sizes and the power of the tests, and implement them by web programing. The result is available over the world wide web. Further, we also provide the power calculations and have them available on the web.

• Communications for Statistical Applications and Methods
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• v.18 no.6
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• pp.707-716
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• 2011

Quantiles and quantile ranks(or plotting positions) are widely used in academia and industry. Sample quantile methods and sample quantile methods implemented in some major statistical software are at least seven, respectively. Small looking differences between the methods can make big differences in outcomes that result from decisions based on them. We discussed the characteristics and differences of the basic plotting position using the empirical cumulative probability and the six plotting positions derived from the suggestion of Blom (1958). After discussing the characteristics and differences of seven quantile methods used in the some major statistical software, we suggested a general expression covering all seven quantile methods. Using the insight obtained from the general expression, we proposed four propositions that make it possible to find the plotting position method that correspond to each of the seven quantile methods. These correspondences may help us to understand and apply quantile methodology.

• Survey Research
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• v.5 no.1
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• pp.103-130
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• 2004

Main monthly household surveys conducted by Korea National Statistical Office are economically active population survey(EAPS) and household income and expenditure survey(HIES). Samples of these two surveys are redesigned every 5 years based on Census. This paper is about sample redesign of household survey conducted in 2002 based on 2000 Census. Main improvements of 2002 sample redesign are the introduction of rotation sampling system, the expansion of HIES survey area from urban to whole country and the foundation of basement to make small area estimation for the unemployment statistics. Also the number of sample households within a enumeration district(ED) is reduced from 24 to 20. That makes it possible to select more ED samples which provides better precision for EAPS and HIES. To select representative samples for the population, different classification index is used for each metropolitan area and provinces.

• Communications for Statistical Applications and Methods
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• v.3 no.3
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• pp.83-92
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• 1996

확률화 블록 계획법에서 우산형 대립가설에 대한 점근 분포 무관 검정법을 제시하고 제안된 검정통계량의 점근적 정규성과 모수적 방법 및 비모수적 방법의 점근상대효율을 관찰하였다. 검점통계량은 블록 효과를 추정하여 제거한 관측치의 전체 블록 순위를 사용하여 제안하였으며 제안된 검정통계량의 소표본 Monte Carlo 연구를 통해 실험 검정력을 비교하였다. 그 결과 본 논문에서 제안된 검정통계량이 꼬리가 두꺼운 분포에서는 전반적으로 우수하고 로버스트한 것으로 나타났다.

• Proceedings of the Korean Statistical Society Conference
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• 2003.10a
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• pp.195-199
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• 2003

Hansen과 Hurwitz(1946)는 우편조사에서의 무응답 문제를 처리하는 방법으로 표본을 응답결과에 따라 응답층과 무응답층으로 나눈 다음, 무응답층의 일부를 랜덤 추출하여 면대면 직접조사에 의해 무응답층의 정보를 얻는 방법을 제안하였다. 본 연구에서는 민감한 모집단에 대한 자료수집 방법으로 직접질문 방법인 Black-Box 방법과 간접질문 방법인 확률화응답기법(RRT)의 결합적 방법을 제시하였고, 층화이중 추출방법을 이용하여 모수를 추정하였다.

• Communications for Statistical Applications and Methods
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• v.2 no.1
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• pp.22-31
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• 1995

본 논문에서는 포아송 반응을 갖는 로그 선형 회귀 모형에 붙스트랩 방법을 이용하여, 여러가지 통계적 추론을 위한 유용한 확률적 결과들을 연구.소개하고, 모의실험을 통한 소표본 성질들을 다양하게 제시하고자 한다. 특히 로그 선형 회귀 모형에 대한 최우 추정량 $\hat{\beta_n}$ 및 정보행렬 I(${\beta}_0$)의 추정량들 $I_1(\hat{\beta_n}{\cdot}X)$와 $I_2(\hat{\beta_n}{\cdot}X)$에 대한 일치성 및 정규성등의 확률적 성질들, 그리고 붙스트랩 방법을 적용한 대표본 성질들과 관련하여 여러가지 모의실험 결과들을 분석.연구하였다.

• Communications for Statistical Applications and Methods
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• v.2 no.1
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• pp.185-193
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• 1995

b개의 블럭과 m개의 처리를 가지는 확률화 블럭 모형에서, 블럭내 순위들 사이의 "near-matches"의 갯수를 이용하여 처리효과의 우산형 대립가설에 대한 순위검정법을 제안하고자 한다.b가 고정되어 있고 처리 m의 갯수를 무한히 하면, Wilcoxon score에 대한 블럭내 순위들을 근거로 해서 제안된 검정법과 수정된 W-검정법과의 점근상대효율을 구하였고, 또한 소표본에서 Monte Carlo 연구를 통하여 제안된 통계량과 수정된 W-통계량을 비교 연구하였다.량을 비교 연구하였다.

• Journal of the Korean Data and Information Science Society
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• v.21 no.4
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• pp.669-679
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• 2010

A sample survey design is suggested for the service satisfaction evaluation of regional education offices based on the sample size of 2009 Gyeongnam regional education offices's customer satisfaction survey. The sample design is developed to fit the goal of evaluation of individual regional offices and allocate at least the minimum sample size to each city or county in Gyeongnam to achieve the goal of the survey. The population is stratified according to the regions and the types of schools, and the sample of schools is selected with proportional to the size of classes within each stratum. Finally, each sample student is selected according to two-stage cluster sampling within each sample school. Weighting averages, weighting totals and so on can be evaluated for analysis purposes. Their variance estimates can be evaluated using re-sampling methods like BBR, Jackknife, linearization-substitution methods, which are generally used for the data from a complex sample.

• The Korean Journal of Applied Statistics
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• v.22 no.1
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• pp.171-179
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• 2009

In this paper we studied the effective approximations to the distribution of the sum of products of normal variables. Based on the saddlepoint approximations to the quadratic forms, the suggested approximations are very accurate and easy to use. Applications to the FSK (Frequency Shift Keying) communication are also considered.