• The Korean Journal of Applied Statistics
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• 제19권2호
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• pp.349-360
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• 2006

PROC MIXED in SAS can be utilized to make inferences on parameters in a mixed model by use of Restricted Maximum Likelihood Estimation Method or Maximum Likelihood Estimation Method which has more merits than ANOVA method. A regression model with unbalanced nested error structure that belongs to a mixed model is used to construct confidence intervals on variances among groups, within groups, and regression coefficients in the model. PROC MIXED is applied to three different sample sizes for simulation. As a result of the simulation study, PROC MIXED generates confidence intervals on parameters that maintain the stated confidence coefficient in a large sample size. However, it does not generate confidence intervals that maintain the stated confidence coefficient for variance components among groups and intercept in a small sample size.

• The Korean Journal of Applied Statistics
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• 제19권2호
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• pp.217-230
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• 2006

e discuss proper confidence intervals for interval estimation of a low binomial proportion. A large sample surveys are practically executed to find rates of rare diseases, specified industrial disaster, and parasitic infection. Under the conditions of 0 < p ${\leq}$ 0.1 and large n, we compared 6 confidence intervals with mean coverage probability, root mean square error and mean expected widths to search a good one for interval estimation of population proportion p. As a result of comparisons, Mid-p confidence interval is best and AC, score and Jeffreys confidence intervals are next.

• The Korean Journal of Applied Statistics
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• 제20권2호
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• pp.257-266
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• 2007

It is known that Agresti-Coull approach is an effective tool for the construction of confidence intervals for various problems related to binomial proportions. However, the Agrest-Coull approach often produces a conservative confidence interval. In this note, confidence intervals based on a Bayesian approach are proposed for a linear function of independent binomial proportions. It is shown that the Bayesian confidence interval slightly outperforms the confidence interval based on Agresti-Coull approach in average sense.

• Women's Health Nursing
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• 제19권1호
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• pp.48-56
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• 2013

Purpose: The purpose of this study was to identify the influencing factors of mothers' confidence in their maternal role during the early postpartum period. Methods: Participants were 178 postpartum women who delivered at three specialized obstetrics and gynecology facilities and used the postpartum care facility in city B. Data were collected from February to April, 2012 using the scales of measurements of self-confidence in maternal role performance, maternal self-esteem, mother-to-infant attachment, social support, and childcare stress. Descriptive statistics, Pearson correlation coefficients, and stepwise multiple regression were used with the SPSS/WIN 18.0 program to analyze the data. Results: The scores for self-confidence in the maternal role showed significant negative correlations with the scores of childcare stress (r=-.40, p<.001). Parity and maternal attachment were significant predictors and accounted for 97.4% of the variance in self-confidence in the maternal role. Conclusion: To strengthen self-confidence in the maternal role of early postpartum mothers, prenatal class programs need to be complemented in order to reduce childcare stress and promote mother-to-infant attachment.

• Journal of Distribution Science
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• 제17권6호
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• pp.25-32
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• 2019

Purpose - Pricing strategy is a very effective marketing activity and has a significant impact on consumer purchasing decisions. Numerous studies have investigated the effects of various pricing strategies. However, tensile price claims have received little attention in the literature. It is thus necessary to investigate how different forms of tensile price claims affect consumer response. This study uses the consumer self-confidence level as a moderator of consumer behavior. Research Research design, data, and methodology - This study investigates the effect of four different tensile price claims (i.e., maximum discount, minimum discount, average discount, and range discount advertisements) on consumers' perceived savings. A survey was conducted to collect data for testing hypotheses. Results - The results show that consumers with high levels of self-confidence perceive more savings for maximum discount advertisements than minimum discount advertisements, for range discount advertisements than average discount advertisements. On the other hand, consumers with low self-confidence feel more perceived savings for average discount advertisements than range discount advertisement. Conclusions - The results of this study provide a new insight into the effectiveness of tensile pricing based on consumer self-confidence levels, which may provide valuable theoretical and practical applications.

• The Korean Journal of Applied Statistics
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• 제21권5호
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• pp.867-873
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• 2008

It is a convention to use 5% significance level when a statistical test is employed for clinical data. But when a confidence interval is used for testing equivalence, 90% confidence interval has often been used. When $1-{\alpha}$ confidence interval is used for hypothesis testing, its significance level is often ${\alpha}$. So it makes a confusion that the significance level is 10% if 90% confidence interval is employed for testing equivalence. In this paper I will clarify this issue by reviewing relevant papers and conducting simulation studies. I hope that it will be beneficial to statisticians in pharmaceutical companies, CROs, university hospitals.

• Journal of Korean Academy of Fundamentals of Nursing
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• 제24권2호
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• pp.128-137
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• 2017

Purpose: This study was conducted to investigate the effects of core basic nursing education using cellular phone video recordings on self-confidence in performance, achievement, and practice satisfaction. Methods: The research design was a nonequivalent control group modified and non-synchronized design. The participants were assigned to either the experimental (n=60) or control group (n=67). During one semester, the experimental group received training for 10 selected core basic nursing skills using cellular phone video recording. The control group, also for one semester, received training with traditional practices. Self-confidence in performance and practice satisfaction were measured using a questionnaire, and achievement was evaluated by professors at the conclusion of the semester. Collected data were analyzed using t-test and Pearson correlation coefficients. Results: Self-confidence in performance increased significantly after training in the experimental group (t=7.94, p<.001). The experimental group showed significantly higher self-confidence in performance (t=2.39, p=.018) and achievement (t=2.40, p=.018) compared to the control group. However, the difference in practice satisfaction was not statistically significant. Conclusion: The results indicate that cellular phone video recording is effective in improving self-confidence in performance and achievement of core basic nursing skills.

• Journal of Families and Better Life
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• 제23권1호
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• pp.113-123
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• 2005

The purpose of this study was to examine the role performance and self-confidence of the fathers with children in grade school. Further, this study explored the variables that affect positively the self-confidence of the fathers. A survey questionnaire was used for this study. The participants of this study were 340 fathers with children aged between seven and nine residing in Gyeongsangnam-do. As for the performance of father's roles, the average score was higher in 'conversation with children' and 'expressing affection to children', whereas it was lower in 'raising children' and 'educating children'. As for the self-confidence regarding their father's roles, the score was higher in the cognitive dimension than in the emotional dimension. In general, the fathers tended to evaluate their role performance as fathers positively. The variables that affected the cognitive dimension of self-confidence as a father were conversation with children, supporter role, under-standing children, and educating children. The variables that influenced the emotional dimension, on the other hand, were child-rearing role, husband's role, supporter role, and expressing love to children.

• Child Health Nursing Research
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• 제14권2호
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• pp.155-162
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• 2008

Purpose: The purpose of this study was to provide basic data for the development of health and safety programs by examining child-care teacher's knowledge, self-confidence and practice concerning the health and safety of children under their care. Method: The participants were 72 teachers from 15 child care centers in Seoul City and Chung-Nam Province. Data were collected using self-report questionnaires. Data were analyzed using descriptive statistics, ANOVA and Pearson correlation coefficients with SPSS 12.0 Win program. Results: The mean score for self-confidence was lower than knowledge and practice. Self-confidence score about emergency care for falls, fractures and resuscitation were lowest. For safety knowledge, scores about facility and environment were lowest. For health knowledge, scores about disease and symptoms were lowest. For practice, scores about seat belts and safe furniture arrangement were lowest. Significant correlations were found between practice and self-confidence. There were significant differences in the degree of knowledge according to education, and in practice according to age. Conclusions: Health and safety education programs for child care teachers are necessary for the promotion of knowledge, self-confidence and practice in health and safety. The results suggest that health and safety education program should be provided systematically and continuously for child care teachers.

• The Journal of Korean Academic Society of Nursing Education
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• 제20권1호
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• pp.5-14
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• 2014

Purpose: The purpose of this study was to determine undergraduate students' level of knowledge, attitude, and confidence toward patient safety. Methods: A descriptive survey design was used. The subjects consisted of 932 senior nursing students who have had clinical practice in nursing schools in a metropolitan city in Korea. The data were collected from March 4th to 28th in 2011. Knowledge, attitude, and confidence on patient safety were measured using self administered questionnaires. Data were analyzed with SPSS 18.0 using descriptive statistics, t-test, One-Way ANOVA, and Pearson correlation coefficient. Results: Knowledge of patient safety was relatively low and attitude and confidence were at moderate level. There were statistically significant differences in knowledge, attitude, and confidence toward patient safety according to gender, educational system, grades, satisfaction with nursing major or clinical practice, and experience of patient safety education or patient safety campaign. There was a significant positive correlation among knowledge, attitude and confidence on patient safety. Conclusion: The study findings suggests that concept and skills on patient safety need to be educated systematically during undergraduate curriculum linked with clinical practicum.