• The Korean Journal of Applied Statistics
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• v.34 no.6
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• pp.937-944
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• 2021

The problem of selecting variables is addressed in partial linear regression. Model selection for partial linear models is not easy since it involves nonparametric estimation such as smoothing parameter selection and estimation for linear explanatory variables. In this work, several approaches for variable selection are proposed using a fast forward selection algorithm, least angle regression (LARS). The proposed procedures use t-test, all possible regressions comparisons or stepwise selection process with variables selected by LARS. An example based on real data and a simulation study on the performance of the suggested procedures are presented.

• Asia-Pacific Journal of Business
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• v.14 no.4
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• pp.1-21
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• 2023

Purpose - The study investigates the role of authenticity of B2B salespersons has on their consultative selling competence. The study also examines the mediating effect of customer orientation between the authenticity of B2B salespersons and their consultative selling competence, as well as the moderating role of trust in the buyer-seller exchange. Design/methodology/approach - This research utilized a covariance-based structural equation model technique. The study assessed the research model's moderation effects through a stepwise approach, which allowed for an examination of the moderating effect of trust in the buyer-seller relationship. Findings - As a result of structural equation analysis, this study found that the authenticity of B2B salespersons influences their consultative selling competence by mediating their customer orientation significantly. In addition, trust in the buyer-seller exchange plays a significant role as a moderating variable between customer orientation and competitive selling competence, but it is not significant as a moderating variable between the authenticity and customer orientation of B2B salespersons. Research implications or Originality - This research proposed the role of authenticity of the B2B salesperson as a key factor in the trust-based relationship and a key variable of consultative selling competence. The study has taken the research on the authenticity of the B2B salesperson one step further from the study of authenticity of the brand and the company's leadership.

• Korean Journal of Adult Nursing
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• v.26 no.4
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• pp.444-454
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• 2014

Purpose: The purpose of the study was to examine the relationships among pain belief, perceived social support, coping strategies, and quality of life of people with noncongenital spinal cord injury and to identify factors influencing quality of life. Methods: A correlational predictive design was used. The data were collected from 197 people with noncongenital spinal cord injury with questionnaires in 2012 in Korea. The data were analyzed using descriptive statistics, t-tests, one-way ANOVA, Pearson's correlation coefficients, and stepwise multiple regression using SPSS/WIN 18.0. Results: Pain belief, perceived social support, and coping strategies were correlated significantly with the quality of life. As a result of stepwise multiple regression analysis, pain belief, perceived social support, coping strategies, damaged area, and time since injury were discovered to account for 59.1% variance of the quality of life. The variable that most affected the quality of life was pain belief followed by perceived social support and coping strategies. Conclusion: The results of the study clearly demonstrate the importance of pain control, social support, and coping skills in order to improve quality of life among people with noncongenital spinal cord injury.

• Korean Journal of Adult Nursing
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• v.16 no.4
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• pp.668-676
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• 2004

Purpose: The purpose of this study was to investigate factors determining health behavior for middle-aged adults in relation to stress coping behaviors, cognitive factors, social support, and sociodemographic variables. Method: The questionnaire survey was carried out on a convenience sample of 203 middle aged in a community settings. The data analysis procedure included frequency, t-test, ANOVA, Pearson correlation coefficient, and stepwise multiple regressions using health behavior as dependent variable. Result: Among the sociodemographic variables, factors such as sex, educational and eonomic levels were associated with the health behaviors. There were significant correlations between health behaviors and saliency of health, social support, and positive-stress coping behaviors. Stepwise multiple regression revealed that the factors such as positive-stress coping behaviors, saliency of health, sex, and education turned out to be significant affecting factors. Twenty eight percent of varience in health behavior was explained by these factors. Conclusion: Positive-stress coping methods were turned out to be the most important effective factors in practicing of health behaviors of middle aged. The necessity of an intervention considering the situation related to their stress and coping methods in middle aged so as to promote positive health behaviors was suggested.

• Korean Journal of Health Education and Promotion
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• v.28 no.4
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• pp.51-61
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• 2011

Objectives: The main purpose of this study was to examine factors associated with depression of middle school students in relation to self-esteem, type A behavior pattern, and locus of control. Methods: A survey was administered to a convenience sample of 309 middle school students. The data analysis procedure included frequency distribution, t-test, ANOVA, Pearson correlation coefficients, and stepwise multiple regression using depression as the dependent variable. Results: The prevalence of depression was 27.2%. Stepwise multiple regression revealed that the factors such as self-esteem(${\beta}$=0.422, p<0.001), type A behavior pattern(${\beta}$=0.166, p<0.001), and locus of control(${\beta}$=-0.165, p<0.001) turned out to be significant affecting factors. Forty nine percent of variance in depression was explained by these factors(40% of variance by self-esteem). Conclusions: The findings suggest that personal internalizing variables should be considered when developing mental health education program to prevent the occurrence of depression for middle school students.

• Korean Journal of Human Ecology
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• v.23 no.2
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• pp.251-268
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• 2014

Applying the data from 64 single(26 men and 38 women) and 71 childless married men and women(37 men and 34 women) aged between 30 and 45, this study is to understand their future fertility intention. For this purpose, ideal and real number of children that participants plan to have were compared using paired t-test. Second, demographic variables(sex, age, marital status), child care related variables(thoughts about caring children, child care value), individual characteristics(gender role attitude, relation orientation) and social context variables(perceived economic condition, recognition of low fertility policies) were included in a stepwise regression model to explain expected number of children participants plan to have in the future. Results showed that ideal number of children participants wish to have was significantly higher than real number of children they expect to have in the Korean society. The stepwise regression model explained 35% of the variance of the dependent variable. Among four types of variables, child care related variables most powerfully explained expected number of children study participants plan to have in the future. Finally, age, child care value, gender role attitude, and relation orientation significantly explained expected number of children in the future.

• Korean Journal of Human Ecology
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• v.16 no.6
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• pp.1131-1140
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• 2007

The purpose of this study is to investigate the effect of parenting behavior and parent-child communication on internet use among school-aged children. The subjects were 215 children whose grade are 3rd and 5th selected from an elementary school in Incheon. The statistics used for this data were t-test, one-way ANOVA(Duncan's test), and stepwise regression. The findings from the present study suggested that academic achievement and birth order turned out to be significant variables on children's internet use, except for sex and grade. Results of the stepwise regression analyses that the etiologic model of this study was more proper, and parenting behavior is more effective variable than parent-child communication in predicting internet use among school-aged children. Implications based on this study are as follows; In order to decrease the degree of school-aged children's internet use, parents should do less permissive parenting behavior and problematic communication with their children.

• Korean Journal of Health Education and Promotion
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• v.22 no.4
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• pp.155-166
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• 2005

Objectives: The purpose of this study was to examine factors influencing the mental health of high school students in relation to sociodemographic variables, family function, self-esteem, social support, and self-identity. Methods: The survey was carried out on a convenience sample of 332 high school students. Data analysis procedure included stepwise regression using mental health as the dependent variable, and sociodemographics, family function, self-esteem, social support, and self-identity, as independent variables. Results: Stepwise multiple regression revealed that the factors such as self-esteem(${\beta}=0.422$, p<0.001), self-identity(${\beta}=0.166$, p<0.001), and sex(${\beta}=-0.165$, p<0.001) turned out to be significant affecting factors. Twenty seven percent of varience in mental health was explained by these factors(22% of varience by self-esteem). Conclusion: Self-esteem was turned out to be the most important effective factor of mental health in high school students. These results suggest that it is important for high school students to promote their self-esteem to keep their good mental health.

• Korean Journal of Health Education and Promotion
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• v.21 no.4
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• pp.109-119
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• 2004

This study was conducted to examine factors influencing mental health of middle-aged adults(N=203) in relation to sociodemographic variables, health behaviors, and social support. The survey with questionnaire was carried out for the subjects of the residents in two communities of a local city located in Gangwon-do, Korea from September 3 to 15, 2003. Data analysis procedure included stepwise multiple regression using mental health as the dependent variable, and sociodemographic variables, health behaviors, and social support as independent variables. There were significant differences in the mental health by birth place(t=-1.67, p<0.10), religion (t=2.27, p<0.05) and subjective economic status(F=2.29, p<0.10). Mental health showed significant positive correlations with both health behavior (r=0.462, p<0.001) and social support (r=0.142, p<0.05). Stepwise multiple regression analysis for mental health revealed that the most powerful predictor was health behavior(β=0.453, p<0.001). Health behavior and religion explained 24％ of the variance. The results suggest the necessity of a intervention that considers the health behaviors should be included in middle-aged adults so as to promote mental health.

• Korean Journal of Health Education and Promotion
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• v.20 no.4
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• pp.1-11
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• 2003

The main purposes of this study were to investigate the content of health behaviors and to examine factors influencing the health behaviors of the elderly. Data regarding the health behavior of 126 people over 65 years of age living in community settings were used. All subjects were interviewed using a semi-structured questionnaire. The questionnaire consisted of sociodemographic variables, health behaviors, present chronic disease, subjective health status, a scale for worthy life, a scale for self-esteem, and a scale for loneliness. Health behaviors included 27questions on diet, exercise, stress-coping, smoking, drinking, a regular medical check-up, social activities, etc. The data analysis procedure included stepwise regression using health behavior as the dependent variable, and sociodemographics, illness, and psychosocial variables as independent variables. Stepwise regression revealed that factors such as feelings of worthy life($\beta$＝-0.350, p＜0.0001), communicating with otjers or the lack there of ($\beta$＝0.183, p＜0.05), and self-esteem($\beta$＝0.196, p＜0.05) were independently and significantly associated with health behaviors. For example, individuals who showed higher levels of worthy life and who had confiding relationships with others tended to practice more health behaviors. Subjects who had a higher level of self-esteem showed the same tendency. These results suggest the necessity of a intervention that considers psychosocial aspects should be included in care of the elderly so as to promote positive health behavior.