• Communications for Statistical Applications and Methods
• /
• 제30권6호
• /
• pp.631-652
• /
• 2023

In the two-condition within-subject mediation design, pairs of variables such as mediator and outcome are observed under two treatment conditions. The main objective of the design is to investigate the indirect effects of the condition difference (sum) on the outcome difference (sum) through the mediator difference (sum) for comparison of two treatment conditions. The natural condition variables mean the original variables, while the rotated condition variables mean the difference and the sum of two natural variables. The outcome difference (sum) is expressed as a linear model regressed on two natural (rotated) mediators as a parallel two-mediator design in two condition approaches: the natural condition approach uses regressors as the natural condition variables, while the rotated condition approach uses regressors as the rotated condition variables. In each condition approach, the total indirect effect on the outcome difference (sum) can be expressed as the sum of two individual indirect effects: within- and cross-condition indirect effects. The total indirect effects on the outcome difference (sum) for both condition approaches are the same. The invariance of the total indirect effect makes it possible to analyze the nature of two pairs of individual indirect effects induced from the natural conditions and the rotated conditions. The two-condition within-subject design is extended to the addition of a between-subject moderator. Probing of the conditional indirect effects given the moderator values is implemented by plotting the bootstrap confidence intervals of indirect effects against the moderator values. The expected indirect effect with respect to the moderator is derived to provide the overall effect of moderator on the indirect effect. The model coefficients are estimated by the structural equation modeling approach and their statistical significance is tested using the bias-corrected bootstrap confidence intervals. All procedures are evaluated using function lavaan() of package {lavaan} in R.

• 대한영양사협회학술지
• /
• 제13권3호
• /
• pp.228-239
• /
• 2007

The purpose of this study was to identify the variables of foodservice employees's job satisfaction. The questionnaires to measure job satisfaction were completed by 323 employees in the Gyunggi province. Foodservice employees' job satisfaction was evaluated by the modified Smith method(1969). All statistical data analyses were conducted using the Statistical Package for the Social Science(SPSS version 12.0). The study results were as follows; 1. The demographic data showed that 65.3% of respondents aged in 40~49 years old, 96% were married, 68.8% were high school graduates, 10.2% were college graduates and 93.5% were contracted employees. 2. Factors that influenced job satisfaction among employees varied significantly. Older workers tended to be more satisfied in their job. In addition, those who had graduated college showed the highest job satisfaction score(3.03). Subjects who had graduated university showed the lowest job satisfaction score(2.05). Subjects who had worked for 2-3 years showed the highest satisfaction scores concerning their relationships with coworkers(3.33), whereas those who had worked less than 2 years showed the lowest (3.14). Regarding school type, employees working in high schools had the highest job satisfaction scores, whereas those working in middle schools had the lowest. Satisfaction of leaving school time, ‘after 4 pm group’ had the highest score(3.01). 3. The correlation between salary satisfaction and job satisfaction was significant(r=0.307, p<0.001). In addition, the correlation between job satisfaction and work satisfaction was also significant(r=0.444, p<0.001). The correlation between job satisfaction and satisfaction about relations with coworkers was significant(r=0.118, p<0.01). The correlation between salary satisfaction and work satisfaction was significant(r=0.308, p<0.001). The correlation between salary satisfaction and satisfaction about relation with coworkers not significant, but it was negative(r=0.307, p<0.001). The correlation between work satisfaction and satisfaction about relations with coworkers significant(r=0.210, p<0.001). According to this study, job satisfaction and salary were positively related. This study provides foodservice managers useful information for design positions that will increase productivity. Future study is needed to determine the factors that will improve job satisfaction and satisfy the employees' needs, which in turn will improve school food service quality.

• 방사성폐기물학회지
• /
• 제18권2_spc호
• /
• pp.247-260
• /
• 2020

본 논문에서는 고리 1호기 해체 비용 추정을 위해 외국 원자력발전소 해체 비용 데이터를 현가화한 후 원자력발전소 해체 비용 추정 회귀 분석모델을 개발하였다. 이 모델 개발에 사용된 데이터는 해체 또는 진행 중인 BWR 13기, PWR 16기의 해체 비용 데이터이다. 회귀 분석모델 도출을 위해, 해체 비용을 종속변수로 정하고, 해체 원전의 운전 특성을 반영할 수 있게 고안된 Contamination factor와 해체 기간을 독립변수로 선정하였다. 빅데이터 분석 도구인 R language의 통계패키지를 이용하여 회귀 분석모델을 도출하였다. 이 회귀 분석 모델을 적용하여 고리 1호기 해체 비용을 예측한 결과, 미화 663.40~928.32백만 달러, 한화 약 7,828.12억~1조 954.18억 원이 소요될 것으로 예측되었다.

• 대한간호학회지
• /
• 제14권1호
• /
• pp.1-20
• /
• 1984

This study was attempted to evaluate and explain the correlation between stress and utilization of Dispensary, Frequency of absence, Frequency of accident as the health condition of bluecollared workers. The subjects for this study were 260 workers selected conveniently from 360 workers working at one chemical manufacturer located in Seoul. The dataas measure the Stress was collected through SRRS (The Social Readjustment Rating Scale) which is developed by Holmes ＆ Rahe (1976) from 27th July to 10th August, 1983. The data of Utilization of Dispensary and Frequency of Accident were brought out from the record of Dispensary during past 8 months. The Frequency of Abscence from January to August were collected through diligence and indolence cards of each department. All collected data were analysed based on the SPSS (Statistical Package for the Social Science) program. The results of the study are as follows: 1. The average of Utilization of Dispensary was 7.4, Frequency of abscence 14.6, frequency of Accident 0.4. 2. The average score of Stress was 134 (minimum : 0, maximum : 593, Standard deviation : 109. 3) It can be considered as a slight stressed group by the requlations of Holmes and Rahe. 3. According to the analysed results of correlation between Stress and the Utilization of Dispensary, Frequency of Absence, frequency of Accident, the Utilization of dispensary and stress were significantly related (r= .1955, p<.001), the Frequency of Absence (r=.0284, p >, 05), and the Frequency of Absence (r=.0284, p>.05), and the Frequency of Accident (r= .0831, p>.05) were not significantly related with Stress. 4. In the relation between general characters of subjects and the Utilization of Dispensary, 20 to 25 aged group, women, single, christian, lent-house dwelling, 1 to 5 years employed group used at a high ratio. 5. In the relation between general character of subjects and the Frequency of Absence, men, 51 to 55 aged group, 21 to 25 years employed group indicated high Frequency, and other char-noters were not significantly related. 6. In the relation between general characters of subjects and the Frequency of Accident, women. single, 20 to 25 aged group, catholic, lent-house dwelling, below 1 year employed group showed high frequency. 7. Stress showed a significant difference only with a religion. Catholic group represented mode-rate stressed scored 209.67, and not significantly related with other general characters.

• 한국학교ㆍ지역보건교육학회지
• /
• 제16권3호
• /
• pp.1-15
• /
• 2015

Objectives: The purpose of this study was to examine the state of ADHD disposition among college students and the impact of their self-esteem on ADHD in an effort to provide useful information on the prevention of ADHD in adults. Methods: A survey was conducted from April 4 to June 30, 2015, on 264 selected students at two different universities that were respectively located in the Daegu and Gyeongsan city. As for data analysis, a statistical package SPSS WIN 18.0 was employed. Results: The findings of the study were as follows: There were significant differences in overall ADHD disposition according to academic year, religion and academic standing, and self-esteem varied with gender, presence or absence of a friend of the opposite gender, academic year and academic standing. There were differences in inattention-memory problems scores, one of the sub factors of adult ADHD, according to presence or absence of a friend of the opposite gender, academic year and academic standing. Self-esteem had a negative correlation with inattention-memory (r=-0.463), hyperactivity(r=-0.269) and impulsiveness(r=-0.233). When a regression analysis was made to determine influential factors for inattention-memory, religion(${\beta}=0.121$), academic standing(${\beta}=-0.153$) and self-esteem(${\beta}=-0.422$) were influential. Conclusions: Adult ADHD disposition and self-esteem of college students seems to be relationship. There was a positive correlation among inattention-memory, hyperactivity and impulsiveness that were three subfactors of adult ADHD.

• 한국치위생학회지
• /
• 제18권5호
• /
• pp.797-806
• /
• 2018

Objectives: The purpose of this study was to analyze Influence of stress on oral health and quality of life. Methods: The participants were 172 students from 4 universities located in DaeJeon, South Korea. A questionnaire was administered, assessing the impacts of the general characteristics of the participants, temporomandibular joint (TMJ) symptoms, xerostomia, and halitosis on stress. And oral impacts on daily performance were also investigated. Data were analyzed using the Statistical Package for the Social Sciences 18.0. Results: The level of stress was higher in female, and the causes of stress was reported scholastic achievement, relations with professors, get a job. The students who were higher stress were more conscious of TMJ symptoms, xerostomia and halitosis(p<0.05). Stress was significantly positively correlated with TMJ symptoms (r=0.376, p<0.001), dry mouth (r=0.360, p<0.001), and bad breath (r=0.343, p<0.001). Oral Impacts on Daily Performance (OIDP) scores were significantly positively correlated with dry mouth, bad breath, TMJ symptoms, and stress. Regression analysis showed that 54.5% of the independent variables were related to OIDP scores. Stress and TMJ symptoms exerted a significant effect on OIDP scores. Conclusions: Stress among university students affects oral health and quality of life. Stress coping mechanisms and oral health care education programs should be developed and applied at universities.

• 가정과삶의질연구
• /
• 제25권6호
• /
• pp.59-70
• /
• 2007

The purpose of this study was to examine the differences among families in terms of conflict, life satisfaction according to socio-demographic variables, and self-esteem, and to analyze the effects of these variables influencing marital satisfaction for immigrant women. The subjects of this study were 127 immigrant women in Sunchon. Trained researchers interviewed the subjects with structured questionnaires. The data were analyzed using Cronbach's ${\alpha}$, frequency, percentage, mean, standard deviation, ANOVA, Duncan's test, Pearson's r, and stepwise multiple regression. The statistical package of SPSS is used to perform these analyses. The result of this study is summarized as follows: The family conflict scores of the immigrant women were lower than the median. The average score of life satisfaction was higher than the median. The family conflict of the immigrant women showed significant differences according of age.

• 한국IT서비스학회지
• /
• 제17권3호
• /
• pp.139-156
• /
• 2018

Smart tolling, which improved the drawbacks of the existing high-pass system, was developed and built through the Smart Highway R & D project in 2007. In order to successfully introduce and spread Smart Tolling, it is need to analyze factors that affected by intent to use. This study conducted research based on literature studies and empirical studies, and developed a research model to analyze factors affecting the users' intention of smart tolling system based on technology acceptance model (TAM) and value based acceptance model. The main variables of the research model are service characteristics (convenience, reliability), technical characteristics (flexibility, stability), environmental characteristics (switching cost, effectiveness of policy) and intention to use. To test the hypotheses set in this study, frequency analysis, exploratory factor analysis, and confirmatory factor analysis were performed using the SPSS 22.0 program statistical package and AMOSS 18.0. The convenience and reliability presented by service characteristics did not affect the intention to use of smart tolling service.

• 가정∙방문간호학회지
• /
• 제27권1호
• /
• pp.82-91
• /
• 2020

Purpose: This study aimed to explore the factors influencing attitudes toward withdrawal of life-sustaining treatment (WLST) in adolescents. Methods: This study used a descriptive research design. A structured questionnaire was administered to 185 adolescents. Data were analyzed based on t-tests, analysis of variance, Pearson's correlation coefficient, and multiple regression using the IBM SPSS 20.0. Statistical package. Results: There was a negative correlation between attitudes toward WLST and respect for life (r=-.188, p=.010). Knowing about life-sustaining treatment (β=-0.30, p<.001), experience of WLST education (β=0.21, p=.003), experience of respect for life education (β=-0.16, p=.021), and experience of death (family or acquaintance) (β=-0.13, p=.039) explained 16.7% (F=8.39, p<.001) of the variance in attitudes toward WLST. The respect for life did not affect attitudes toward WLST (β=-0.07, p=.347). Conclusion: The study findings suggest that WLST in adolescents is different from that of adults. Further research is needed to develop strategies for sound and positive attitudes toward WLST in adolescents.

• 한국치위생학회지
• /
• 제14권5호
• /
• pp.731-738
• /
• 2014

Objectives : The purpose of this study is to investigate the knowledge, practice, and awareness toward oral health in the special school teachers. Methods : A self-reported questionnaire was filled out by 133 teachers in special education schools in Seoul, Gyeonggi-do, Chungbuk, and Jeonbuk. Data were analyzed using the statistical package SPSS WIN 12.0 for frequency, t-test, one-way ANOVA, Scheffe test(post hoc test), and Pearson's correlation coefficient. Results : In oral health knowledge, the average score of female teachers was 8.31 in comparison to 7.75 in male teachers(p<.05). In oral health practice, the average score of female teachers was 3.71 and that of male teachers was 3.69. In oral health awareness, the average score of female teachers was 4.12 and male teachers had 3.93. The teachers in special schools had a close positive correlation between oral health awareness and practice(r=.448, p<.05). Conclusions : The teachers tended to have better knowledge of oral health but they did not practice the oral health behavior. The teachers have the important role in oral health management for the disabled children by providing the right toothbrushing method.