• 응용통계연구
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• 제15권1호
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• pp.119-128
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• 2002

Rao와 Yu(1994)는 소지역 추정(small area estimation) 문제를 해결하기 위한 방법으로 추정 시점과 인접지역 정보 등 보조정보와 과걱의 표본조사 결과를 모두 이용하는 모형과 그 모형으로 부터 경험적최량선형비편향추정량(Empirical Best Unbiased Predictor)을 제안하였다. 본 논문에서는 Rao와 Yu의 모형에서 미지의 모수에 대한 사전확률분포를 가정한 계층적 베이즈 추정량을 제안하고, 이를 미국의 주별 4인가족 소득추정문제에 적용하여 그 효율을 미국의 Census Bureau에서 사용하고 있는 경험적 베이즈추정량 및 이전에 제안된 다른 추정량들과 비교하였다.

• 한국조사연구학회지:조사연구
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• 제12권2호
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• pp.89-112
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• 2011

본 연구는 농가경제조사를 패널자료화한 결과와 패널화된 자료를 이용하여 실제로 자료를 분석하는 예를 제시하였다. 본고의 분석결과 예시는 농가경제조사와 같은 반복횡단면자료의 경우 사후적으로 패널화함으로써 다양한 동태분석이 가능함을 보여주고 있다. 또한 횡단면가중치의 존재를 감안하였을 때 종단면가중치 문제도 비교적 수월하게 해결할 수 있는 가능성이 있음을 알 수 있다. 본고의 경험을 바탕으로 할 때 최근 통계청에서 새롭게 패널조사를 실시하려는 계획을 수립, 집행하고 있는 바, 이와 더불어 통계청에서 기존에 실시하고 있는 유사한 구조의 반복횡단면조사의 경우에도 패널화 작업을 수행할 필요가 있다고 판단된다. 물론 이러한 패널화 작업의 이점은 실제로 패널조사로 진행되고 있는 사업체조사에서 더욱 명확하게 나타날 것으로 예상되며, 향후에는 사업체 횡단면자료의 패널화작업을 시도할 필요가 있다고 할 것이다.

• 한국조사연구학회지:조사연구
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• 제9권2호
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• pp.151-166
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• 2008

이 논문은 경지면적조사에서 분리비추정량을 활용하는 방법을 다루고 있다. 경지면적조사는 해마다 실시되는 일종의 계속조사로서 각 시.도에서 선정된 층화표본으로부터 분리비추정량을 이용하여 경지면적을 추정하고 있다. 분리비추정법을 계속조사인 경지면적조사에 적용하려 할 때 현실적으로 직면하는 문제로는, (i) 해가 지나면서 모집단 조사구수가 바뀌는 문제, (ii) 일부 층에서 보조변수가 0의 값을 취하는 문제, 그리고 (iii) 표본재설계로 인하여 층화 기준이 바뀌는 문제 등을 들 수 있다. 이 논문에서는 경지면적조사에서 발생하는 이와 같은 현실적인 문제들을 고찰한 후, 경지면적조사에 적용 가능한 조정된 분리비추정량을 제시하였다.

• Communications for Statistical Applications and Methods
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• 제12권2호
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• pp.365-379
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• 2005

Balanced Repeated Replication(BRR) is widely used to estimate the variance of linear or nonlinear estimators from complex sampling surveys. Most of survey data sets include imputed missing values and treat the imputed values as observed data. But applying the standard BRR variance estimation formula for imputed data does not produce valid variance estimators. Shao, Chen and Chen(1998) proposed an adjusted BRR method by adjusting the imputed data to produce more accurate variance estimators. In this paper, another adjusted BRR method is proposed with examples of real data.

• 응용통계연구
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• 제32권4호
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• pp.643-652
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• 2019

본 연구에서는 반복조사의 표본재설계에서 설계요소를 반영한 표본수 결정 방법을 제안하였다. 제안된 방법은 다단추출과 층화다단추출 등에 적용할 수 있으며 시점간 모집단 구성 변화, 집락효과, 표본할당 등의 주된 설계요소가 갖는 표본오차에 대한 영향력을 구분하여 반영하므로 보다 전략적인 표본수 결정이 가능할 수 있다.

• Journal of the Korean Statistical Society
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• 제26권2호
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• pp.245-259
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• 1997

The paper shows that certain hierachical Bayes (HB) predictors for small domain data in repeated surveys "universally" or "stochastically" dominate all linear unbiased predictors. Also, the HB predictors are "best" within the class of all equivariant predictors under a certain group of transformations.tain group of transformations.

• Communications for Statistical Applications and Methods
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• 제14권3호
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• pp.593-600
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• 2007

Under repeated surveys, missing values often appear for various reasons and are replaced by new samples. It is investigated that the existing estimator in repeated survey by Jessen (1942), which has been originally developed for the new samples of fixed size, can be used in such situation where the size of new samples is random. It is shown that the proposed estimator has smaller variance than the sample mean.

• Journal of the Korean Data and Information Science Society
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• 제25권1호
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• pp.263-269
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• 2014

When the loss of samples appears under repeated surveys, new samples can often replace missing values. Estimators using response probability can be considered under repeated surveys on two occasions where new samples are selected instead of missing data on the second occasion. We propose a new estimator that uses both respondents and new samples on the second occasion. It is considered for the simulation setting that missing values can happen at the second occasion and are replaced by new samples. We can see that the proposed estimator is more efficient than that using a weighting adjustment method for respondents at the second occasion.

• 한국컴퓨터정보학회논문지
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• 제24권8호
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• pp.159-166
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• 2019

In this paper, we propose takes network marketing as a starting point for analysis, uses the theory of purchasing behavior and enterprise performance to analyze the network marketing strategy of artistic products, incorporates the practical problems encountered by some artistic products enterprises in Zhejiang Province in network marketing into theoretical research. The theoretical model of network marketing strategy acting on enterprise performance through the intermediary effect of purchasing behavior is constructed. This paper conducted an in-depth survey of three representative core domestic companies engaged in Internet marketing of artistic products, and analyzed the questionnaires of 357 respondents. The initial model was verified by statistical tools such as SPSS and AMOS, and three conclusions were drawn: Firstly, network marketing strategies of different dimensions have different effects on purchasing behavior: pricing strategy and product strategy have significant positive effects on impulse purchasing behavior, but channel strategy has no significant impact on impulse purchasing behavior; Channel strategy and product strategy have a significant positive impact on repeated purchasing behavior, but pricing strategy has no significant impact on repeated purchasing behavior. Second, user purchasing behavior has a significant positive impact on enterprise performance. Third, network marketing strategies of different dimensions have significant direct and positive impact on enterprise performance.

• Human Ecology Research
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• 제60권1호
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• pp.69-86
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• 2022

The present study examined the effectiveness of repeated marriage checkups at intervals of six months in a Family Center in Seoul. To achieve this, the pilot study protocol (Park, 2019) was adapted, emphasizing strength-based, counseling-oriented approaches. Two couples and family therapists with master's degrees were trained and their practice was monitored to ensure program fidelity. The methods employed for the assessment of marriage checkup were an online survey, a video recording of couple problem-solving, and a clinical interview. A total of 14 couples participated in the 1st checkup, 10 of whom also completed the 2nd checkup. Couples with varying levels of marital satisfaction participated in the program. Descriptive statistics indicated gradual increases over 8-9 months in diverse indices such as marital satisfaction and relationship strength, while other indices fluctuated slightly but converged to higher levels over time. A non-parametric analysis appropriate for small samples demonstrated statistically significant increases over the 8-9 months in marital satisfaction among couples. The current study evidenced the effectiveness of repeated marriage checkups in the Family Center, which is the primary public institution for family policy and services in Korea. Repeated marriage checkups are therefore a promising way to enhance couples' relationship health and improve the family management system of the Family Center.