• Journal of The Korean Association For Science Education
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• v.25 no.5
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• pp.624-633
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• 2005

Line graphs are frequently used to communicate data and basic concepts in classroom activities, Science teachers often assume that students are able to interpret the symbolic meaning of the graphs, but such an assumption is not based on sufficient evidence, The purpose of this study was to investigate the relationships of graphing ability to science-process skills and academic achievement of high school students: With regard to science-process skills, graphing ability was found to have a slight correlation with science-process skills (.41). Among the sub-skills of the science-process, graphing ability was seen to have a relatively high correlation with basic science-process skills such as 'measuring', 'inferring', 'predicting', while having relatively low correlation with integrated science-process skills such as 'formulating hypothesis' and 'generalization', With regard to academic achievement, graphing ability appeared to have no correlation with academic achievement (.06). Hence, a correlation between graphing ability and science-process skills was proved. It can also be concluded that improving graphing ability will greatly support students with their science study and, therefore, organized efforts and efficient educational methods should be developed in order to overcome the insufficient graphing ability among high school students.

• Proceedings of the Korean Statistical Society Conference
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• 2003.05a
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• pp.127-130
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• 2003

주변분포가 Laplace 분포인 세 가지 형태의 이변량 Laplace 분포를 연구한다. 각각의 이변량 Laplace 분포의 확률밀도함수와 누적분포함수를 유도하고, 분포의 그래프를 그려봄으로써 분포의 형태를 알아본다. 조건부 적률을 정리하여 조건부 첨도와 조건부 왜도를 구하고 분포의 성질을 파악한다. 상관계수를 구하여 다른 이변량 분포의 상관계수와 비교해 보았다. 그리고 정의된 분포함수를 응용하여 이변량 Laplace 분포를 따르는 난수벡터를 발생하는 알고리즘을 제안하였으며, 생성된 난수벡터의 표본으로부터 구한 표본평균과 중앙값의 분산-공분산 행렬식을 구하고 이변량 정규분포에 대응하는 행렬식과 비교 토론하였다.

• Proceedings of the Korean Statistical Society Conference
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• 2005.11a
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• pp.107-112
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• 2005

A시 B구에서 2005년 5월 16일부터 6월 30일까지 지역주민(4개 동민)과 해당 구청의 직원들을 대상으로 음주문화에 관한 설문조사를 실시하였다. 응답자들을 지역주민과 구청직원의 그룹으로 분류한 다음, 각 그룹별로 주요 설문문항에 대하여 답변항목별 분포를 살펴보고, 성별분포와 연령대별 분포를 SPSS로 빈도분석을 실시하고 Excel을 이용하여 그래프를 제시하였다. 설문조사를 통하여 음주와 관련된 주요 홍보대상을 파악한 후 그 대상을 목표로 음주관련 사업의 집중도를 높이는데 그 목적이 있다.

• Journal of the Korean Data and Information Science Society
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• v.10 no.1
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• pp.261-269
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• 1999

In this paper we implement statistical information system on the database interface using java on the WWW. Users on get statistical information on the web.

• The Journal of the Korea Contents Association
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• v.19 no.1
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• pp.141-151
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• 2019

A network of graph data structure is used in many applications to represent interactions between entities. Recently, as the size of the network to be processed due to the development of the big data technology is getting larger, it becomes more difficult to handle it in one server, and thus the necessity of distributed processing is also increasing. In this paper, we propose a distributed processing system for efficiently performing subgraph and stores. To reduce unnecessary searches, we use statistical information of the data to determine the search order through probabilistic scoring. Since the relationship between the vertex and the degree of the graph network may show different characteristics depending on the type of data, the search order is determined by calculating a score to reduce unnecessary search through a different scoring method for a graph having various distribution characteristics. The graph is sequentially searched in the distributed servers according to the determined order. In order to demonstrate the superiority of the proposed method, performance comparison with the existing method was performed. As a result, the search time is improved by about 3 ~ 10% compared with the existing method.

• Communications for Statistical Applications and Methods
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• v.3 no.3
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• pp.303-310
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• 1996

1987년도와 1992년도에 한국 갤럽에서 대통령 선거 결과를 예측하기 위하여 실시한 바 있는 여론 조사 결과를 그래픽으로 분석하였다. 1987년도에는 각 후보에 대한 직접적인 지지도보다 종교별 후보 지지도 예측에 발표의 촛점이 맞춰져 있었으므로 이 발표 결과를 다각적으로 분석하였고, 1992년도에는 각 후보의 직접적인 지지도 분석에 촛점을 두었다.

• Communications for Statistical Applications and Methods
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• v.4 no.1
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• pp.243-254
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• 1997

특정분포에 대한 P-P plot과 Q-Q plot의 특징을 분석하고 두 가지 그래프 사이의 관계를 비교해 보았다. NTV의 본질적인 특징을 알아보고 각 특정분포에 대한 NTV plot의 특징을 분석했다. 전형적인 bimodal 분포가 나타날 때 P-P 혹은 Q-Q plot은 뚜렷한 break-point를 갖는다는 것을 알아보고, 단지 skewed된 분포나 skewed된 것처럼 보이는 bimodal 분포 사이에서 발생하는 판단의 어려움에 대하여 여러 plot고찰해 보았다.

• Journal of the Korean Data and Information Science Society
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• v.10 no.2
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• pp.429-436
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• 1999

We suggest test statistics for normality using Q-Q plot and P-P plot and obtain empirical quantities of these statistics. Also the power comparison with Shapiro-Wilk's W is conducted by Monte Carlo study.

• The Korean Journal of Applied Statistics
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• v.19 no.3
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• pp.447-460
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• 2006

This paper develops a multiple comparison method for finding an optimal ordering of K geometric means of exponential parameters. This is based on the paired comparison experimental arrangement whose results can naturally be represented by a completely oriented graph. Introducing posterior preference probabilities and stochastic transitivity conditions to the graph, we obtain a new graphical model that yields criteria for the optimal ordering in the multiple comparison. Necessary theories involved in the method and some computational aspects are provided. Some numerical examples are given to illustrate the efficiency of the suggested method.

• The Korean Journal of Applied Statistics
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• v.8 no.1
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• pp.61-74
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• 1995

These days, many kinds of graphical methods have been developed, and it is possible to get information directly from data. Especially, R-code (Cook and Weisberg, 1994) make it possible to draw various kinds of two and three dimensional plots, and to rotate the axis of the plots. But the maximum dimensional of the plot is three, so we can not draw plot of one response variable with more than three explanatory variables. Li(1991, 1992) has developed a method to reduce the dimension of the explanatory variables, so it is possible to draw lower dimensional plots to get information of the full explanatory variables. One of the dimension reduction method developed by Li is pHd. In this paper, we have tried to apply the pHd method for the model with multivariate response.