• The Korean Journal of Financial Management
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• v.14 no.2
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• pp.205-228
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• 1997

본 연구는 1982년부터 1996년까지의 유로달러선물과 T-bill 선물의 일별 시계열 자료를 이용하여 단기금리선물의 가격발견기능을 실증적으로 검정하고 있다. 분석방법은 시계열의 불안정성 여부를 알아보는 단위근검정, 장기균형관계를 알아보는 Johansen 공적분검정, 공적분관계가 있는 시장에 대해 설정오류의 문제를 피하고 변수들간의 인과관계를 파악하기 위해 Granger 인과관계모형을 사용하였다. 주요한 결과로 각 금리시계열들은 일차누적 시계열 I(1)임이 확인되었고 공적분관계를 분석한 결과, 각 금리 시계열의 선형결합은 안정적인 장기균형관계가 있음을 나타내 주고 있다. 따라서 각 시장은 서로 밀접한 인과관계가 있음을 암시하고 있다. 또한 선물금리와 현물금리를 대상으로 인과관계검정 결과 유로달러시장의 경우 전기에서는 피드백효과가 있고 후기에는 선물금리의 가격발견기능이 나타났다. T-bill 시장의 경우는 전기에 현물금리가 선물금리에 대해 선행하였고 후기에는 피드백효과가 나타났다. 이렇게 유로달러선물이 후기에서 가격발견기능이 있는 것은 정보통신의 발달과 유로시장의 적은 규제 등으로 유로달러선물시장이 1980년대 후반부터 급성장한 것이 그 원인으로 분석된다.

• Journal of the Korean Data and Information Science Society
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• v.21 no.6
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• pp.1243-1251
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• 2010

For clinical trials, it is common to compare the placebo and new drug. The method of calculating a sample size for two independent populations are the t-test that is used for parametric methods, and the Wilcoxon rank-sum test that is used in the non-parametric methods. In this paper, we propose a method that is using Kim's (1994) statistic power based on the linear placement statistic, which was proposed by Orban and Wolfe (1982). We also compare the sample size for the proposed method with that for using Wang et al. (2003)'s sample size formula which is based on Wilcoxon rank-sum test, and with that of t-test for parametric methods.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.07a
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• pp.57-58
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• 2019

RPG장르를 기준으로 15세 이용가 게임인 리니지2와 청소년 이용 불가 게임인 아이온을 선정하여 게임간의 평균 이벤트 기간의 차이를 조사, 분석한 결과, 두 게임간의 평균 이벤트 기간은 리니지2가 47일이고 아이온이 54일로 다소 차이는 있으나, 양측검정 결과를 보면 P값이 0.794(P>0.05)로 두 게임간의 평균 이벤트 기간은 차이가 없음을 알 수 있다. 이에 본 연구에서는 전체이용가와 청소년이용불가 게임을 선정하여 게임간의 평균 이벤트 기간의 차이를 연구하였다.

• Journal of Korea Society of Industrial Information Systems
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• v.16 no.2
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• pp.191-198
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• 2011

In this paper, we examine the different viewpoints of teachers and undergraduates on middle school informatics textbook. For this research, a survey is conducted on middle school informatics teachers and undergraduates who are preparing the state examination for informatics-computer teachers. Items of the survey were chosen to investigate the level of completion on the contents and structure of the textbook and to examine overall satisfaction with the textbook. Seven items concerning the level of completion are based on national textbook authorization criteria. A t-test was performed to analyze meaningful difference in perception of textbook between the teacher and student groups. The result shows there is meaningful difference on two items which are 'compliance with informatics curriculum' and 'content selection and organization'.

• Journal of the Korean Data Analysis Society
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• v.20 no.6
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• pp.2805-2812
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• 2018

The methylation score, expressed as a percentage of the methylation status data derived from the iterative sequencing process, has a value between 0 and 1. It is contrary to the assumption of normal distribution that simply applying the t-test to examine the difference in population-specific methylation scores in these data. In addition, since the result may vary depending on the number of repetitions of sequencing in the process of methylation score generation, a method that can analyze such errors is also necessary. In this paper, we introduce the symbolic data analysis and the interval K-S test method which convert observation data into interval data including uncertainty rather than one numerical data. In addition, it is possible to analyze the characteristics of methylation score by using Beta distribution without using normal distribution in the process of converting into interval data. For the data analysis, the nature of the proposed method was examined using sequencing data of actual patients and normal persons. While the t-test is only possible for the location test, it is found that the interval type K-S statistic can be used to test not only the location parameter but also the heterogeneity of the distribution function.

• The Journal of Korean Academic Society of Nursing Education
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• v.15 no.1
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• pp.120-127
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• 2009

Purpose: In the literature power analysis in experimental studies is often executed and reported falsely. This descriptive study was done to promote the correct application of the Cohen(1988)'s power analysis method. Method: Articles of experimental studies from a nursing journal were selected and reviewed to examine the uses of and the reports on the power analysis process. Also, the appropriate power analysis process was discussed with an example of the most common experimental design, an independent two-group design with t test analysis plan. Result: Around half the experimental studies examined reported that they carried out power analysis. Cohen's method was the most frequently utilized but with accuracy in question. Conclusion: Power analysis to estimate sample size is the interplay between alpha, power, and effect size, and other factors in the case of t test analysis. Researchers should have a clear understanding of how to apply the Cohen's power analysis method so they do not produce poorly estimated sample sizes.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2015.05a
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• pp.221-222
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• 2015

Since the input data such as types and quantities of materials cannot be acquired during the planning and designing phases, it is difficult to estimate the carbon emissions from the construction phase. As the materials are closely related to the building usages, an approximate estimation by the usages can be suggested. However, before confirming the estimation, the difference test among the carbon emissions of the building usages should be implemented. This study executed t-test or Mann-Whitney test between apartments and schools. The result of the study statistically verified the significant difference between the carbon emissions of apartments and schools.

• Journal of the Korean Data and Information Science Society
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• v.27 no.2
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• pp.373-380
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• 2016

Even though Likert type data is ordinal scale, many researchers who regard Likert type data as interval scale adapt as parametric methods. In this research, simulations have been used to find out a proper analysis of Likert type data. The locations and response distributions of five point Likert type data samples having diverse distribution have been evaluated. In estimating samples' locations, we considered parametric method and non-parametric method, which are t-test and Mann-Whitney test respectively. In addition, to test response distribution, we employed Chi-squared test and Kolmogorov-Smirnov test. In this study, we assessed the performance of the four aforementioned methods by comparing Type I error ratio and statistical power.

• Korean Journal of Construction Engineering and Management
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• v.3 no.1 s.9
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• pp.74-82
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• 2002

The performance testing system of temporary construction equipment and materials are a previous inspect institution to produce only goods beyond the limited-performance, be certificated through a previous test, the purpose of which is to prevent an illegal goods from spreading abroad. The formal certification not only pass the test in an ordinary means but also isn't the term of validity on a certificated goods. Because of the above two reasons, an accident doesn't reduce, and a illegal goods become to be circulated. So, in this study, we analysis the problem of the follow-up service based on the formal certification and we suggest the improvement through comparative study on the follow-up of domestic and foreign.

• Journal of Digital Convergence
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• v.11 no.12
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• pp.495-505
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• 2013

This study aims to evaluate the effects of aromatherapy and a foot reflex massage program on the cognition, anxiety, aggressive behavior, and wandering behavior of elderly with dementia. The research design was a non-equivalent control group, quasi-experimental study where 43 subjects were divided into two groups. Aromatherapy and foot reflex massage was administered to the experimental group (N=21), and no treatment was administered to the control group (N=22). The data was analyzed using the ${\chi}^2$-test, t-test, while the repeated measures of ANOVA were utilized with the SPSS/Win 18.0 program. The experimental group did not show significant differences in cognitive function; however, it showed significant differences in anxiety, aggressive behavior, and wandering behavior in relation to the control group. Thus this research suggests aromatherapy and a foot reflex massage program as nursing intervention to improve the quality of life of elderly with dementia.