• The Korean Journal of Applied Statistics
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• v.14 no.2
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• pp.415-427
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• 2001

공간통계학에서는 다변량 공간자료에 대한 예측방법으로서 코크리깅 기법을 이용한다. 본 논문에서는 코크리깅을 위한 첫 번째 단계인 교차베리오그램의 추정에 대한 감도분석 대신에 일반통계학적 측면에서 주성분점수를 이용한 감도분석방법을 제안한다. 변수가 2개인 경우, 교차베리오그램에 대한 감조분석의 결과와 제안된 주성분점수를 이용한 감도분석의 결과를 비교해 본다. 모의실험을 통하여 제안한 방법의 타당을 검증하고, 실제 자료를 이용한 사례분석의 결과로써 재확인해 본다.

• Journal of the Korea Society of Computer and Information
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• v.28 no.9
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• pp.177-188
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• 2023

The purpose of this study is to develop and validate a scale for measuring digital literacy by identifying the factors consisting of digital literacy and extracting items for each factor. Preliminary items for the Delphi study were developed through the analysis of previous literature and the deliberation of the research team. As a result of two rounds of the expert Delphi study, 65 items were selected for the main survey. The validation of the items was carried out in the process of exploratory and confirmatory factor analyses, reliability test, and criterion validity test using the data collected in the main survey. As a result, a 4-factor structure composed of 31 questions(factor 1: digital technology & data literacy- 9 questions, factor 2: digital content & media literacy- 8 questions, factor 3: digital communication & community literacy- 9 questions, factor 4: digital wellness literacy - 5 questions) was confirmed. Also, the goodness of fit indices of the model were found to be good and the result of reliability test revealed the scale had a very appropriate level of Cronbach's alpha(α=.956). In addition, a statistically significantly positive correlations(p<.001) were found between digital literacy and internet self-efficacy and between digital literacy and self-directed learning ability, which were predicted in the existing evidence, therefore the criterion validity of the developed scale was secured. Finally, practical and academic implications of the study are provided and future study and limitations of the study are discussed.

• Korean Journal of School Psychology
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• v.9 no.3
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• pp.485-503
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• 2012

Academic engagement has been known as a strong predictor of students' cognitive and affective outcomes in an educational context. Despite increasing interest and theoretical usefulness of this construct, a few researchers seem to be interested in the validation of instruments to measure academic engagement for Korean students. Thus, this study would like to introduce one of academic scales widely used, UWES-S(Utrecht Work Engagement Scale-Student) (Schaufeli et al., 2002a: 2002b) and to validate the UWES-S for Korean college students. To validate the Korean version of the UWES-S, 651 college students (285 for Field Trial, 366 for Main Study) were used. The procedure is as follows. First, we used an integrated adaptation procedure to produce a Korean version of the UWES-S. Second, EFA(exploratory factor analyses) was applied to explore the factor structure of the UWES-S on the field trial data. Third, the psychometric properties of the UWES-S items were examined by graded response model(GRM). Also CFA(confirmatory factor analysis) was used to examine its internal construct validity for the data from the main study. Finally, the external validity of the UWES-S was scrutinized with the related variables such as academic motivation and satisfaction. As a result, the Korean version of the UWES-S with 13 items was accepted that the four items were excluded from its original version. Second, the internal validity was supported that the 3 factor CFA model(vigor, dedication, absorption) fit the data well. Third, we supported the partial mediation model that academic engagement played as a mediating variable between academic motivation(internal/external) and academic satisfaction. Finally, the differences between a validation of UWES-S for Korean college and high school students, the necessity of construct equivalence testing, and direction for future research of scale validating were discussed.

• The Korean Journal of Financial Studies
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• v.6 no.1
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• pp.93-117
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• 2000

본 논문의 목적은 1991년부터 1996년까지 부실이 된 상장기업 41개사와 이에 대응하는 118개 건전기업의 표본을 가지고 주요 재무정책변수를 이용하여 로짓분석에 의한 기업부실예측모형을 구축하는데 있다. 본 연구에서는 기존연구와는 달리 이론적으로 타당하고 재무경영자의 관심대상인 투자정책변수, 자본조달정책변수 및 배당정책변수를 가장 잘 반영한다고 판단되는 12개의 재무비율을 사전적으로 선정하였다. 이들 12개의 재무비율에 대해 부실기업과 건전기업을 가장 잘 판별할 수 있는 재무비율을 선정하기 위하여 프로파일 분석과 두 표본 t검정을 하였다. 그 결과 투자정책, 자본조달정책, 그리고 배당정책을 대표하는 변수로 자기자본순이익률, 총자본부채비율 및 배당율이 각각 채택되었다. 그리고 현금흐름변수를 추가하였다. 이 네 변수를 이용하여 로짓분석을 실행하였다. 먼저 부실 1년전부터 부실 5년전까지 각 연도별로 부실예측모형을 추정하였다. 부실 1년전의 추정모형에 의하면 총자본부채비율을 제외한 모든 계수의 부호는 (-)로 모두 기대했던 대로 나타났다. 전체적으로 볼 때 부실 4-5년 전에는 자기자본순이익률과 총자본부채비율이 기업부실에 유의한 영향을 주나 부실전 3년간은 현금흐름과 배당률의 크기가 부실에 영향을 주는 것으로 나타났다. 본 연구는 부실예측모형을 기업의 재무정책적인 관점에서 추정하였다는 데 그 의의가 있다고 할 수 있다.

• The Korean Journal of Applied Statistics
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• v.22 no.5
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• pp.923-935
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• 2009

This study aims to explore a recommended model of decision tree to predict a hard-to-measure measurement in anthropometric survey. We carry out an experiment on cross validation study to obtain a recommened model of decision tree. We use three split rules of decision tree, those are CHAID, Exhaustive CHAID, and CART. CART result is the best one in real world data.

• Journal of the Korea Convergence Society
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• v.12 no.5
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• pp.85-91
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• 2021

This study is a methodological study that explains the procedure for verifying effectiveness in developing practical guidelines for cognitive programs suitable for dementia patients. Based on the development of evidence-based new clinical practice guidelines, a preliminary recommendation for the domestic dementia patient care guidelines was developed. The practical guidelines consisted of the final four types, and the content validity score of the configuration items was 0.87 to 1 point. In the sub-categories of field applicability, appropriateness score was 3.95 to 4.34 points, applicability score was 3.57 to 4.27 points, and predicted effect score was 3.84 to 4.22 points. Through the examination of the content validity and field applicability of experts, it was confirmed that the practical guidelines developed in this study can be used as the basis for establishing an intervention plan for dementia cognitive program managers engaged in clinical practice. In future studies should further facilitate the development of evidence-based treatment guidelines to select appropriate treatment activities for dementia patients.

• The Journal of Korean Association of Computer Education
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• v.9 no.6
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• pp.11-18
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• 2006

The purpose of this paper is to draw problems from analyzing "General Computer" questions of Career Searching Section in the College Scholastic Ability Test in 2005 and 2006 and to offer some suggestions about them. For the qualitative research, this paper analyzed content validity. For the quantitative research, this paper analyzed item difficulty and item discrimination by using Bayesian 1.0 based on 2-parameter item response model and this paper analyzed item reliability and distracters by using Testan 1.0. By analyzing "General Computer" questions, this paper would like to improve the quality of items and estimate item difficulty. Therefore, "General Computer" questions could be suggested as materials for developing reliable and discriminative questions.

• Journal of the Korean School Mathematics Society
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• v.10 no.1
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• pp.113-127
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• 2007

This study explored the possibility of building a statistical model predicting difficulty of mathematics test items through the analysis of nation-wide scholastic ability test results for the past 5 years. Multiple linear regression analysis was conducted in predicting difficulty of mathematics test items. We adopted three major areas for independent variables: the content area, the behavior area, and the test item format area, each of which was categorized into more detailed sub-areas. For the dependent variable, the proportion of correct answer was used to represent the item difficulty. Statistically significant independent variables were included in the regression model based on the stepwise selection method. Several important factors affecting difficulty of mathematics test items for each area were identified. R-squares for the final regression model were fairly high, implying that the regression equation can be used to predict difficulty of test items at an acceptable level. Lastly, the regression model was cross-validated using independently collected data. We believe that this study will provide basic but very critical information for predicting the proportion of correct answer by showing the factors that should be considered for developing mathematics test items for the college entrance examination or high school classroom test.

• Korean Journal of Psychosomatic Medicine
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• v.11 no.1
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• pp.77-88
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• 2003

Objectives: The purpose of this study was to compare reliability and validity of three Korean versions of the 20-item Toronto Alexithymia scale and to confirm the most reliable and validated Korean translation of the 20-item Toronto Alexithymia Scale for both clinical and research purpose in Korea. The first one was a Korean version of the 20-Item Toronto Alexithymia Scale developed by Lee YH et al in 1996 which was designated as TAS-20K(1996) in this study. This scale had a problem with one item due to the cultural difference regarding the word 'analyzing' between western culture and Korean culture. The second one was the revised version of TAS-20K(1996) on that point by Lee YH et al in 1996 without validation which was designated as TAS-20K(2003) in this study. The third one was a 23-item Korean version developed by Sin HG and Won HT in 1997, which was somewhat different from the 20-item Toronto Alexithymia Scale(TAS-20) in the number of total item, the content of some items and the scoring method. This scale was designated as S-TAS here. Methods: 408 medical students were tested with one scale composed of all the different items randomly arranged from the three versions. We evaluated goodness-of-fit and Cronbach $\alpha$ coefficients of three scales for reliability. We used confirmatory factor analysis to compare validity. Results: TAS-20K(2003) showed that it had better internal consistency than TAS-20K(1996), which implied that the cultural difference should be considered in the Korean translation. Both TAS-20K(2003) and S-TAS replicated three-factor structures and had adequacy of fit, good internal consistency and acceptable validity. However, S-TAS had one item with poor item-factor correlation and didn't show high correlation between item 2 and factor 1 as before in 1997. Conclusion: Although S-TAS had added 3 items and changed the content of two items, it didn't show better reliability and validity than TAS-20K(2003). Therefore it is proposed to use TAS-20K (2003) as the Korean version of the 20-item Toronto Alexithymia Scale(TAS-20K) for international communication of results of Alexithymia research. It has good internal consistency and validity and maintains original items, the same construct and scoring method as the 20-item Toronto Alexithymia Scale.

• Korean Journal of Culture and Social Issue
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• v.27 no.3
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• pp.259-284
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• 2021

The present study was conducted to develop and validate a psychological scale that measures individuals' attitude toward unification of Korea (ATU-K). Building on major theoretical perspectives on the structure of attitude and the attitude-behavior link, we specified two sub-components each representing the cognitive and the affective dimension of people's attitude toward unification. In a survey that involved a stratified sample of Korean adults (N = 1,500), we found strong evidence showing the construct validity of the ATU-K scale. We also found evidence for the convergent and discriminant validity of the scale. In a second survey involving another stratified sample of 1,500 Korean adults, we found the utility of the ATU-K scale in predicting people's intention to engage in unification-oriented behaviors (personal/collective). We also found that the ATU-K scale fares better in predicting the intention vis-a-vis the other measures of unification-related beliefs reported in previous research. We discuss implications of our findings and directions for future research.