• Journal of the Korean Data and Information Science Society
• /
• v.20 no.2
• /
• pp.321-328
• /
• 2009

In regression analysis, the ordinary least squares estimates of regression coefficients become poor, when the correlations among predictor variables are high. This phenomenon, which is called multicollinearity, causes serious problems in actual data analysis. To overcome this multicollinearity, many methods have been proposed. Ridge regression, shrinkage estimators and methods based on principal component analysis (PCA) such as principal component regression (PCR) and latent root regression (LRR). In the last decade, many statisticians discussed sensitivity analysis (SA) in ordinary multiple regression and same topic in PCR, LRR and logistic principal component regression (LPCR). In those methods PCA plays important role. Many statisticians discussed SA in PCA and related multivariate methods. We introduce the method of PCR and LRR. We also introduce the methods of SA in PCR and LRR, and discuss the properties of SA in PCR and LRR.

• Asia-Pacific Journal of Business
• /
• v.11 no.3
• /
• pp.63-77
• /
• 2020

Purpose - The purpose of this study is to examine the effects of personal characteristics, loan characteristics, and interest rate characteristics of 2,653 borrowers on the delinquency possibility. In doing so, this study applies both multiple regression and logistic regression models to the data of credit unions in the city of Daegu. Design/Methodology/Approach - The major results of multiple regression analysis using SPSS are as follows. Findings - As for the results of testing the significance of the regression coefficients, it has been found that among the personal characteristics variables membership, credit rating, credit rating changes, and LTV have significant positive (+) effects on the delinquency possibility. Also it has been shown that among the loan characteristics variables loan amount, loan balance, total debt amount, collateral type, collateral amount, and repayment method have significant positive (+) effects on the delinquency possibility. Furthermore it has been found that among the interest rate characteristics variables both overdue interest rate and interest rate spread have positive (+) effects on the delinquency possibility. However, it has been shown that among the personal characteristics variables equity and membership do not have significant effects on the delinquency possibility, and that normal interest rate among the interest rate characteristics variables also do not have a significant effect on the delinquency possibility. Research Implications - By systematically analyzing the variables affecting delinquency possibility based on the results of this study, credit unions might get positive help in improving the system of managing receivables. Furthermore, the results of this study could be extended and applied to other types of financial institutions, so that financial institutions in general will also get some help to systematically manage the delinquency possibility.

• Journal of Yeungnam Medical Science
• /
• v.40 no.1
• /
• pp.78-85
• /
• 2023

Background: Poor sleep quality is associated with psychoactive substance abuse/addiction/withdrawal. Auricular acupuncture (AA) is a nonpharmacological method used for the treatment of sleep disturbances. This study aimed to examine the quality of sleep before and after AA in participants with mental and behavioral disorders due to prior multiple drug use in the therapeutic community. Methods: This was a consecutive case series of 27 participants (25 male [92.6%]). The median age was 35.0 years (interquartile range [IQR], 29.0-37.2 years), methadone/buprenorphine were not used, and the participants were treated with AA (median number of treatments, 15.0 [IQR, 12.0-18.0]) during a median period of 51.0 days (IQR, 49.0-51.0 days) according to the National Acupuncture Detoxification Association (NADA)-Acudetox protocol. Sleep quality was determined using the Pittsburgh Sleep Quality Index (PSQI), a self-rated questionnaire that assesses sleep quality and disturbances over a 1-month interval. Results: The global PSQI score dropped (indicating better sleep quality) by a median of 3.0 points (IQR, 0.0-8.0 points) after treatment. In the multivariate logistic regression analysis, with an increase in global PSQI score during AA by 1 point, there was a 0.73-fold reduction in the risk of poor sleep quality post-AA (adjusted odds ratio, 0.73; 95% confidence interval, 0.52-1.01; p<0.055; Nagelkerke's R² =0.66). Conclusion: The results revealed a positive effect of AA (by the NADA-Acudetox protocol) on sleep quality (as measured by PSQI) among participants in a treatment center with mental and behavioral disorders due to multiple drug use.

• Korea Journal of Hospital Management
• /
• v.26 no.3
• /
• pp.68-83
• /
• 2021

Background: It is widely acknowledged that single bedrooms have many potential advantages compared to multiple bedrooms. However, Korea has a reimbursement system that patients have to pay the additional fee if they will use single bedroom or pay-bed (1-3 bedroom). There is little research on patients' bed selection and relationship between patient satisfaction and bed type in the Korean setting. Methods: Using the 2017 Korea Health Panel (KHP) Survey data, we modified bed type by two dichotomous variables: single bedroom vs. multiple bedroom (2+ bedrooms) and pay-bed (1-3 bedroom) vs. reimbursed bed (4+ bedroom). Multivariate logistic regression is performed to determine the factors affecting the patient's choice of room types. Multivariate regression analysis was conducted to examine how hospital room types are affecting patient satisfaction. Results: Single room and pay-bed (1-3 bedroom) use was influenced by patient age (19- years old), male, a person at work, hospitalizing in a clinic, and birth. After controlling variables of the behavioral model of medical utilization, the association between patient satisfaction and use of single bedroom & pay-bed (1-3 bedroom). Cause of hospitalization, major treatment, and recognition of unnecessary care are statistically significant variables on patient satisfaction. Conclusion: Although the single room is about the standard for newly built hospitals in western countries, it remains unclear that single room or pay-bed (1-3 bedroom) has positive effects on patient's outcomes and satisfaction. In this empirical study, the difference in patient satisfaction by bedroom type was not noticeable. In terms of bed management by hospital staff, securing patient credibility in hospital care is an important task. Patients' perception of whether medical staffs have encouraged unnecessary treatment or tests has a significant impact on patient's satisfaction.

• Journal of dental hygiene science
• /
• v.15 no.5
• /
• pp.542-550
• /
• 2015

The purpose of this study was to examine the relationship between the oral health behavior and oral health belief of transportation workers. The subjects in this study were 270 selected taxi drivers who engaged in the taxi transportation industry in Jeollabuk-do. They were selected by convenience sampling. To determine the influence of their general characteristics and oral health belief on scaling experience and oral health education experience, a logistic regression analysis was made. And a multiple regression analysis was made by selecting general characteristics and oral health behavior as independent variables and by selecting oral health belief as a dependent variable. A statistical package SPSS for Windows ver. 12.0 was employed to make all the statistical analysis. As a result of making the logistic regression analysis, benefit that was one of the subfactors of oral health belief had something to do with oral health education experience, and the subfactors that exerted an influence on scaling experience were benefit, susceptibility and barrier. When the multiple regression analysis was carried out to find out influential factors for oral health belief, monthly mean income had an impact on susceptibility and barrier among the subfactors of oral health belief, and self-rated oral health status affected seriousness and barrier. There were differences among the taxi drivers in oral health belief according to their own characteristics, and oral health belief was linked to oral health behavior. Therefore oral health belief and oral health behavior should be taken into account when it's planned to promote the oral health of taxi drivers.

• Korean Journal of Social Welfare
• /
• v.54
• /
• pp.35-64
• /
• 2003

This study is to explore experience on the inter-organizational linkages for vocational rehabilitation of people with psychiatric disabilities and to find out predictors affecting the linkages. This study used triangulation a way as to combine the advantages of both the qualitative and the quantitative approach. The qualitative approach is based on grounded theory by Strauss & Cobin. The quantitative research used the samples of 122 organizations, and was analyzed by multiple regression & logistic regression. The results are as follows. First, as results of in-depth interview, interviewees perceived linkage experience as 'turning the eyes on the other organization in community', namely 'the pursue of collaboration'. This concept is classified four types: initiative, cooperative, authoritative and passive type. Second, according to Tobin(1986)'s five phase of the closeness of inter-organizational linkages, our linkages were found to be in third phase, "coordination". Finally, predictors of the attempt of having linkages & linkage strengthening were analyzed by logistic regression & multiple regression. 'The experience of professional training on people with psychiatric disabilities' and 'the resource dependency' have statistically significant relation with the attempt to have linkages. 'The length of current service', 'the experience of professional training on people with psychiatric disabilities', and 'recognition about other organizational activities' are significantly related to strengthening linkage. Based on the results of this study, alternatives for promoting inter-organization linkages for vocational rehabilitation of people with psychiatric disabilities were proposed.

• The Journal of the Korea Contents Association
• /
• v.12 no.12
• /
• pp.683-693
• /
• 2012

In this study we investigated the factors determining people's decision on whether to subscribe to private health insurance, on how many private health insurances they subscribe to and the average amount of monthly payment from subscribers of private health insurances. For analysis, logistic regression analysis and multiple linear regression analysis were conducted on the sample of 8,167 people using 2008 Korean Longitudinal Study of Ageing(KLoSA) data. From the analysis, whether to enroll in private health insurance is found to be greatly influenced by population and socioeconomic factors as well as regular exercise, smoking, cognitive function scores, subjective health status, hospitalization, the number of outpatient services, free primary health screenings benefits. We also found that number of private health insurances purchased is affected by age, household income, subjective health status, drinking, free primary health screenings benefits and that the average amount of monthly payment for private health insurances purchased is influenced by age, marriage status, economic activities status, subjective sense of hierarchy, household income, drinking, hospitalization. This study is expected to contribute to show the healthy role of private health insurance so that the desirable direction in expansion of health security policy in Korea can be explored further.

• Journal of dental hygiene science
• /
• v.17 no.2
• /
• pp.108-115
• /
• 2017

The purpose of this study was to investigate the influence of dental hygienist images and career advice among high school teachers. A self-reported questionnaire was administered to 212 high school teachers in Gwangju, South Korea. The questionnaire contained subject's general characteristics, images of dental hygienists, and career advice. We performed an independent t-test, the Kruskal-Wallis test, Pearson's correlation coefficient, multiple regression analysis, and logistic regression analysis using the IBM SPSS ver. 21.0 software. Using a five-point scale, the average of all the dental hygienist images was 3.50, with personal images receiving the most positive rating at 3.83 and social images receiving the least positive rating at 2.86. The images of dental hygienists were significantly more positive in instances where the subjects recognized the dental hygienist or received treatment within one year. There were positive correlations among different kinds of images. Through multiple regression analysis, occupational images were associated with business and social images. Business images were associated with occupational and personal images. Personal images were associated with business images, especially in cases where the subjects recognized the dental hygienist. Social images were associated with occupational images, especially in cases where subjects received treatment within one year. Through logistic regression analysis, career advice was associated with social and occupational images. Therefore, our study provides suggestions on how to enhance positive recognition of social images of dental hygienists.

• Journal of Preventive Medicine and Public Health
• /
• v.42 no.1
• /
• pp.49-58
• /
• 2009

Objectives : The purpose of the current study was to evaluate the usefulness of the following four comorbidity indices in gastric cancer patients who underwent surgery: Charlson Comorbidity Index(CCI), Cumulative Illness rating scale(CIRS), Index of Co-existent Disease(ICED), and Kaplan-Feinstein Scale(KFS). Methods : The study subjects were 614 adults who underwent surgery for gastric cancer at K hospital between 2005 and 2007. We examined the test-retest and inter-rater reliability of 4 comorbidity indices for 50 patients. Reliability was evaluated with Spearman rho coefficients for CCI and CIRS, while Kappa values were used for the ICED and KFS indices. Logistic regression was used to determine how these comorbidity indices affected unplanned readmission and death. Multiple regression was used for determining if the comorbidity indices affected length of stay and hospital costs. Results : The test-retest reliability of CCI and CIRS was substantial(Spearman rho=0.746 and 0.775, respectively), while for ICED and KFS was moderate(Kappa=0.476 and 0.504, respectively). The inter-rater reliability of the CCI, CIRS, and ICED was moderate(Spearman rho=0.580 and 0.668, and Kappa=0.433, respectively), but for KFS was fair(Kappa=0.383). According to the results from logistic regression, unplanned readmissions and deaths were not significantly different between the comorbidity index scores. But, according to the results from multiple linear regression, the CIRS group showed a significantly increased length of hospital stay(p<0.01). Additionally, CCI showed a significant association with increased hospital costs (p<0.01). Conclusions : This study suggests that the CCI index may be useful in the estimation of comorbidities associated with hospital costs, while the CIRS index may be useful where estimatation of comorbiditie associated with the length of hospital stay are concerned.

• Journal of the Korea Society of Computer and Information
• /
• v.27 no.11
• /
• pp.173-179
• /
• 2022

This study was conducted to provide basic data for the development of oral health education programs by examining oral health knowledge and oral health behaviors, and by identifying factors affecting oral health knowledge and scaling experience of Chinese domestic students. From March to May, a self-reported questionnaire was administered to 194 in the G area. The data were analyzed frequency analysis and independent t-test, multiple regression analysis, logistic regression analysis by using SPSS/WIN 26.0 program. The overall average of oral health knowledge was 13.83 out of 24, and knowledge of periodontal disease and scaling was the highest at 3.75, and knowledge of oral hygiene products was the lowest at 1.38. Oral health knowledge was significantly higher in those who had scaling experience for the past year, brushed teeth for more than 3 minutes at a time, used oral hygiene products, and had oral health education experience. As a result of multiple regression analysis, oral health education experience was the most important factor on oral health knowledge. As a result of logistic regression analysis, oral health knowledge was the most influential factor on scaling experience. It is necessary to expand education on the importance of oral care and actively introduce oral health management program for Chinese domestic students.