• Communications for Statistical Applications and Methods
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• v.19 no.3
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• pp.471-478
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• 2012

In this paper, we present a permutation test to select the number of pairs of canonical variates in canonical correlation analysis. The existing chi-squared test is known to be limited to normality in use. We compare the existing test with the proposed permutation test and study their asymptotic behaviors through numerical studies. In addition, we connect canonical correlation analysis to regression and we we show that certain inferences in regression can be done through canonical correlation analysis. A regression analysis of real data through canonical correlation analysis is illustrated.

• Journal of the Korean Chemical Society
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• v.64 no.2
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• pp.111-118
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• 2020

The purpose of this study is to explore the progression of MMK and the relationship between MMK progression level and actual practice. First, the Rasch model was used to measure MMK progression level of 51 students twice during the interval of one year. Thereafter, chi-squared test was used to determine whether there was a significant change in MMK progression. As a result of chi-squared test, there was no statistically significant change in MMK progression (p>.05). Secondly, we analyzed the relationship between MMK progression level and practice for 7 gifted students. As a result of the analysis, it was confirmed that the student's response in practice can not exceed MMK progression level. There were also cases where students have high MMK progression level showed low response in practice. The results of these two studies show that gifted education programs are needed to increase MMK progression and to provide gifted education that can connect knowledge and practice.

• The Korean Journal of Applied Statistics
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• v.33 no.5
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• pp.555-567
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• 2020

Hypertension has a steadily increasing incidence rate as well as represents a risk factors for secondary diseases such as cardiovascular disease. Therefore, it is important to predict the incidence rate of the disease. In this study, we constructed nomograms that can predict the incidence rate of hypertension. We use data from the Korean National Health and Nutrition Examination Survey (KNHANES) for 2013-2016. The complex sampling data required the use of a Rao-Scott chi-squared test to identify 10 risk factors for hypertension. Smoking and exercise variables were not statistically significant in the Logistic regression; therefore, eight effects were selected as risk factors for hypertension. Logistic and Bayesian nomograms constructed from the selected risk factors were proposed and compared. The constructed nomograms were then verified using a receiver operating characteristics curve and calibration plot.

• Journal of Korean Society of Water and Wastewater
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• v.12 no.3
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• pp.99-106
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• 1998

This paper presents a procedure for determining the design rainfall depth and the design rainfall intensity at Incheon city area in Korea. In this study the eight probability distributions are considered to estimate the probable rainfall depths for 11 different durations. The Kolmogorov - Smirnov test and the Chi-square test are adopted to test each distribution. The probable rainfall intensity formulas are then determined by i) the least squares (LS) method, ii) the least median squares (LMS) method, iii) the reweighted least squares method based on the LMS (RLS), and iv) the constrained regression (CR) model. The Talbot, the Sherman, the Japanese, and the Unified type are considered to determine the best type for the Incheon station. The root mean squared (RMS) errors are computed to test the formulas derived by four methods. It is found that the Unified type is the most reliable and that all methods presented herein are acceptable for determining the coefficients of rainfall intensity formulas from an engineering point of view.

• Journal of the Korean Society of School Health
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• v.32 no.3
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• pp.135-143
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• 2019

Purpose: This study aimed to identify factors affecting the intention to donate organs among high school students. Methods: Data were collected using a questionnaire to measure the knowledge, attitudes, and intention regarding organ donation among 382 high school students in three high schools in one city in December 2018. Data analysis using SPSS 20.0 included a chi-squared test, the Mann-Whitney U test and a logistic regression model. Results: 69.9% of the subjects responded they had intention to donate organs. The factors influencing their organ donation intention were interest in organ donation (odds ratio: OR=3.49, p<.001), knowing the meaning of brain death (OR=7.79, p<.001), acceptive attitude (OR=4.35, p<.001), and exclusive attitude (OR=0.34, p<.001). Conclusion: Organ donation intention is an important factor in the interest in, knowledge of, and positive attitude towards organ donation. High school students should be educated to improve their knowledge and positive attitude regarding organ donation to increase their intention to donate organs.

• Korean Journal of Clinical Laboratory Science
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• v.47 no.1
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• pp.11-16
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• 2015

This paper presents an investigation into factors influencing the level of prostate specific antigens (PSAs) in men with a focus on abdominal obesity. Data were collected from the exam results and medical records of male clients that visited a university hospital in Suwon for a general check-up. The data of total 1,039 were put to frequency analysis, descriptive statistics, independent-sample t-test, one-way ANOVA, chi-squared test, and multiple regression analysis. The subjects were men in their twenties to in their seventies. The study analyzed whether there would be differences in mean PSAs according to the characteristics of the subjects and found significant differences according to age, BMI, and waist. The findings indicate that abdominal obesity influences the level of PSAs in men and that men with abdominal obesity should not neglect the level of PSAs even in the normal range.

• Korean Journal of Human Ecology
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• v.19 no.4
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• pp.625-639
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• 2010

This study compared male and female university students' perceptions of parenthood and their need for pre-parental educational program. Responses of 579 university students in 5 universities were collected using a questionnaire developed by the researchers. Data were analyzed using a T-test and Pearson's chi squared test. Results showed that (1) systematic and pre-parental education may increase opportunities for university students to prepare parent and child rearing skills. (2) Any pre-parent educational program developed should cover practical and such as communication skills, child-rearing techniques and ways of disciplining children. In this way an educational program could provide university students suitable guidance and give them a positive and proper attitude toward parenting should they become parents in the future.

• International Journal of Reliability and Applications
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• v.2 no.4
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• pp.263-268
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• 2001

Shanmugam(1991) generalized the Poisson distribution to capture a restriction on the incidence rate $\theta$ (i.e. $\theta$ ＜ $\beta$, an unknown upper limit), and named it incidence rate restricted Poisson (IRRP) distribution. Using Neyman's C($\alpha$) concept, Shanmugam then devised a hypothesis testing procedure for $\beta$ when $\theta$ remains unknown nuisance parameter. Shanmugam's C ($\alpha$) based .results involve inverse moments which are not easy tools, This article presents an alternate testing procedure based on likelihood ratio concept. It turns out that likelihood ratio test statistic offers more power than the C($\alpha$) test statistic. Numerical examples are included.

• Journal of Korean Biological Nursing Science
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• v.21 no.4
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• pp.292-299
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• 2019

Purpose: The purpose of this study was to determine whether poor preoperative nutritional status in elderly patients exhibited a negative influence on postoperative clinical outcomes. Methods: The medical records of 645 elderly patients were examined retrospectively. The patients had undergone major surgery between January 2017 and January 2018. Their nutritional status was measured using the Nutritional Risk Screening 2002. The data were analyzed using the chi-squared test, the Mann-Whitney U test, logistic regression, linear regression, Cox proportional hazards regression, and the Kaplan-Meier analysis. Results: Preoperative malnutrition was found in 73 patients (11.3%). Poor preoperative nutritional status was significantly associated with pressure ulcers, length of hospitalization, discharge to patient care facilities rather than home, and mortality rate at three months. Conclusion: Preoperative malnutrition in elderly patients was associated with negative postoperative clinical outcomes. These results indicate that an effective nutritional program before surgery can lead to a more rapid postoperative recovery.

• Archives of Plastic Surgery
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• v.39 no.3
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• pp.204-208
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• 2012

Background : Isolated pure blowout fractures are clinically important because they are the main cause of serious complications such as diplopia and limitation of extraocular movement. Many reports have described the incidence of blowout fractures associated with diplopia and limitation of extraocular movement; however, no studies have statistically analyzed this relationship. The purpose of this study was to demonstrate the correlation between the location of isolated pure blowout fractures and orbital symptoms such as diplopia and limitation of extraocular movement. Methods : We enrolled a total of 354 patients who had been diagnosed with isolated pure blowout fractures, based on computed tomography, from June 2008 to November 2011. Medical records were reviewed, and the prevalence of extraocular movement limitations and diplopia were determined. Results : There were 14 patients with extraocular movement limitation and 58 patients complained of diplopia. Extraocular movement limitation was associated with the following findings, in decreasing order of frequency: floor fracture (7.1%), extended fracture (3.6%), and medial wall (1.7%). However, there was no significant difference among the types of fractures (P=0.60). Diplopia was more commonly associated with floor fractures (21.4%) and extended type fractures (23.6%) than medial wall fractures (10.4%). The difference was statistically significant (Bonferroni-corrected chi-squared test P<0.016). Conclusions : Data indicate that extended type fractures and orbital floor fractures tend to cause diplopia more commonly than medial wall fractures. However, extraocular movement limitation was not found to be dependent on the location of the orbital wall fracture.