• Title/Summary/Keyword: Spearman's Rho Test

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Analysis of Domestic Water Consumption Characteristics for Water Usage Purpose (가정용수의 사용 목적별 소비경향 특성분석)

  • Choi, Sun-hee;Son, Mi-na;Kim, Sang-hyun
    • Journal of Korean Society of Water and Wastewater
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    • v.22 no.1
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    • pp.23-29
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    • 2008
  • Throughout the analysis of field data from water distribution system, valid parameters were determined that can be included in the water service and design plan. This study investigates water consumption patterns to understand the variation of water-demand structures utilizing the pattern analysis of domestic purpose water. Water use data were collected by a public water resources management firm in Korea, Kwater, for 140 houses monitored during three years. Flow meters were installed at the faucet for drinking water, the shower booth, the laundry machine, bathroom sink, toilet, and garden faucet. Data was filtered using multiple physically meaningful criteria to improve analysis credibility. Mann Kendall and Spearman's Rho tests were used to carry out the analysis. Distinct factors of water consumption patterns can be determined for both increasing and decreasing trends of water use. Throughout the data analysis, the characterization of terms was classified and analyzed by the condition of the location of water-demand. Analysis of this data provide a physical basis for the parameter configuration of a reasonable design for a domestic water demand prediction model.

The Reliability and Validity Testing of Korean Version of the Pittsburgh Sleep Quality Index (한국어판 피츠버그 수면의 질 지수(PSQI-K) 도구의 신뢰도와 타당도 검증)

  • Shin, Seunghwa;Kim, Su Hyun
    • Journal of Convergence for Information Technology
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    • v.10 no.11
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    • pp.148-155
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    • 2020
  • The purpose of the study was to test the reliability and validity of the Korean version of Pittsburgh Sleep Quality Index (PSQI-K) and to examine the cutoff point of the PSQI-K for screening insomnia among young adults. The subjective quality and patterns of sleep in 64 participants were measured using PSQI-K and Fitbit Charge 3TM. The properties of the instrument were analyzed using Cronbach's alpha coefficient for the internal consistency reliability, factor analysis for the construct validity, and Spearman's rho correlation coefficient for the correlation between the PSQI-K total scores and Fitbit tracker scores. The Cronbach's alpha coefficient of the PSQI-K was 0.69. The Spearman's rho correlation coefficient between the PSQI-K and Fitbit tracker was higher than 0.67. A cutoff point of ≥6.0 had a sensitivity of 0.93 and a specificity of 0.84. In conclusion, the PSQI-K is a reliable and valid instrument to evaluate sleep disturbance in Korean young adults.

Ketamine-Induced Behavioral Effects Across Different Sub-Anesthetic Dose Ranges in Adolescent and Adult Mice (다양한 마취하 용량에서 케타민에 의해 유발된 청소년기 및 성체 마우스의 행동학적 변화)

  • Choi, Hyung Jun;Im, Soo Jung;Park, Hae Ri;Lee, Seong Mi;Kim, Chul-Eung;Ryu, Seunghyong
    • Korean Journal of Biological Psychiatry
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    • v.27 no.1
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    • pp.27-35
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    • 2020
  • Objectives Ketamine has been reported to have antidepressant effects or psychotomimetic effects. The aim of this study was to investigate the behavioral effects of ketamine treatment at various sub-anesthetic doses in adolescent and adult naïve mice. Methods In each experiment for adolescent and adult mice, a total of 60 male Institute of Cancer Research mice were randomly divided into 6 groups, which were intraperitoneally treated with physiological saline, 10, 20, 30, 40, and 50 mg/kg ketamine for consecutive 3 days. At 1 day after last injection, the locomotor and depressive-like behaviors were evaluated in mice, using open field test (OFT) and forced swim test (FST), respectively. Results In case of adolescent mice, ketamine dose was negatively correlated with total distance traveled in the OFT (Spearman's rho = -0.27, p = 0.039). In case of adult mice, we found significant positive correlation between ketamine dose and duration of immobility in the FST (Spearman's rho = 0.45, p < 0.001). Immobility time in the 50 mg/kg ketamine-treated mice was significantly higher compared to the saline-treated mice (Dunnett's post-hoc test, p = 0.012). Conclusions We found that the repeated treatment with ketamine could decrease the locomotor or prolong the duration of immobility in mice as the dose of ketamine increased. Our findings suggest that sub-anesthetic doses of ketamine might induce schizophrenia-like negative symptoms but not antidepressant effects in naïve laboratory animals.

Clinical Implication of Acetylcholinesterase in Acute Organophosphate Poisoning (유기인계 농약 중독 환자에서 초기 적혈구 아세틸콜린에스테라제 활성도의 임상적 의의)

  • Kim, Hoon;Han, Seung-Baik;Kim, Jun-Sig;Lee, Mi-Jin;Park, Joon-Seok;Kwon, Woon-Yong;Eo, Eun-Kyung;Oh, Bum-Jin;Lee, Sung-Woo;Suh, Joo-Hyun;Roh, Hyung-Keun
    • Journal of The Korean Society of Clinical Toxicology
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    • v.6 no.1
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    • pp.25-31
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    • 2008
  • Purpose: Acute organophosphate (OP) poisoning may be monitored by measuring the acetylcholinesterase (AChE). It is important to assess severity and establish prognostic tests in the early stage of OP poisoning. The aim of this study was to look at the relationship between various clinical aspects of the OP poisoning, prognostic indicators of OP poisoning including Simplified Acute Physiology Score (SAPS) 3, and the associated changes in AChE levels. Methods: Clinical data and initial AChE levels from thirty-seven patients with OP poisoning were prospectively reviewed from 12 teaching hospitals in South Korea from August 2005 to July 2006. Clinical manifestations at the time of arrival such as miosis, respiratory abnormality, salivation, urinary incontinence, GCS score, AVPU scale, need for intubation, and mechanical ventilation requirements were recorded. SAPS 3 was calculated using clinical data and laboratory results. Results: The median level of AChE was 9.8 (1.3-53.6) U/gHb. There was no significant difference in AChE levels between the groups with and without cholinergic symptoms. The median level of AChE of the patients who required intubation and those who did not were 3.5 U/gHb and it 19.7 U/gHb respectively (Mann-Whitney test; p<0.001). The AChE levels were also significantly different (p=0.007) in patients who needed mechanical ventilation compared to those who did not with AChE levels found to be 3.1 U/gHb and it was 14.8 U/gHb, respectively. Level of consciousness assessed using the AVPU scale was correlated with AChE levels (Kruskal-Wallis test; p=0.013). GCS score were correlated with AChE levels (p=0.007, Spearman's rho = 0.454). In addition, the lower the level of initial AChE, the longer the ICU stay (p=0.029, Spearman's rho=-0.380). SAPS 3 was inversely correlated with the initial AChE (p<0.001, Spearman's rho=-0.633). Conclusion: In the acute OP poisoning, low AChE levels appear to help indicate the severity of poisoning. The initial AChE level may be a useful prognostic parameter for acute OP poisoning.

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The Effects of Subjective Health Status on Life Satisfaction of Female College Students: A Mediator Effect of Self-leadership (전문대학 여대생의 주관적 건강상태가 생활만족도에 미치는 영향: 셀프리더십을 매개효과로)

  • Lee, Yun Ju
    • Journal of Industrial Convergence
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    • v.17 no.2
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    • pp.35-43
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    • 2019
  • The purpose of this descriptive correlational study was to identify the mediated effects of self-leadership on the relationship between subjective health status and living satisfaction of female university students. After collecting data from the 400 female college students at A University in Incheon from November 14 to November 30, 2016, the frequency analysis, t-test, Spearman's rho, multiple regression analysis, and the Sobel test were conducted using the SPSS 21.0 program. The life satisfaction of students was different depending on age of 20, a freshman, experience in part-time jobs and subjective health status. It has been shown that self-leadership is partially mediated in the relationship between subjective health status and life satisfaction. The results of this study could be used as a basic data for increasing interest in subjective health status and for continuing to develop programs related to self-leadership in order to enhance the life satisfaction of female college students.

Cyclic fatigue resistance tests of Nickel-Titanium rotary files using simulated canal and weight loading conditions

  • Cho, Ok-In;Versluis, Antheunis;Cheung, Gary S.P.;Ha, Jung-Hong;Hur, Bock;Kim, Hyeon-Cheol
    • Restorative Dentistry and Endodontics
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    • v.38 no.1
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    • pp.31-35
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    • 2013
  • Objectives: This study compared the cyclic fatigue resistance of nickel-titanium (NiTi) files obtained in a conventional test using a simulated canal with a newly developed method that allows the application of constant fatigue load conditions. Materials and Methods: ProFile and K3 files of #25/.06, #30/.06, and #40/.04 were selected. Two types of testing devices were built to test their fatigue performance. The first (conventional) device prescribed curvature inside a simulated canal (C-test), the second new device exerted a constant load (L-test) whilst allowing any resulting curvature. Ten new instruments of each size and brand were tested with each device. The files were rotated until fracture and the number of cycles to failure (NCF) was determined. The NCF were subjected to one-way ANOVA and Duncan's post-hoc test for each method. Spearman's rank correlation coefficient was computed to examine any association between methods. Results: Spearman's rank correlation coefficient (${\rho}$ = -0.905) showed a significant negative correlation between methods. Groups with significant difference after the L-test divided into 4 clusters, whilst the C-test gave just 2 clusters. From the L-test, considering the negative correlation of NCF, K3 gave a significantly lower fatigue resistance than ProFile as in the C-test. K3 #30/.06 showed a lower fatigue resistance than K3 #25/.06, which was not found by the C-test. Variation in fatigue test methodology resulted in different cyclic fatigue resistance rankings for various NiTi files. Conclusions: The new methodology standardized the load during fatigue testing, allowing determination fatigue behavior under constant load conditions.

Trend and Shift Analysis for Hydrologic and Climate Series (수문 및 기후 자료에 대한 선형 경향성 및 평균이동 분석)

  • Oh, Je Seung;Kim, Hung Soo;Seo, Byung Ha
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.26 no.4B
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    • pp.355-362
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    • 2006
  • Several techniques of MK test, Spearman's Rho test, Linear Regression test, CUSUM test, Cumulative Deviation, Worsley Likelihood Ratio test, Rank Sum test, and Students' t test were applied to detect the trends of slope and shift which exist in hydrologic and climate time series. The time series of annual rainfall, inflow, tree ring index, and southern oscillation index (SOI) were used and the trends of these series were compared in the study. From the results, it can be found that the data could be classified into two categories such as linear trend and shift. 4 series data of 8 rainfall series which reveal the trend show the shift and 8 series data of 18 tree ring index and March and April series of monthly SOI data show shift. Moreover, ADF test and BDS test were used to test stationarity and non-linearity of the data. In conclusion, through the study, various trend analysis techniques were compared and 6 kinds of characteristics which can exist in hydrologic time series were identified.

Learning Effects of Web Based Instruction by Characteristics of Early Childhood Educators in Training (웹기반 교육에서의 예비 유아교사의 학습자 특성과 학습효과간의 관계 연구)

  • Chun, Hui-Young
    • Korean Journal of Child Studies
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    • v.25 no.4
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    • pp.163-175
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    • 2004
  • In this study, 63 university seniors majoring Child Studies were in an 8-week Web Based Instruction (WBI) program. Student characteristics of learning motivation, self-regulatory learning strategy, and learning style (Kolb, 1985) were the independent variables. Learning effects as dependent variables were measured by paper test and work assessment. Spearman's $\rho$ was calculated and tests of rank order difference were used for the data analysis. Results showed that learning motivation and self-regulatory learning strategy had meaningful positive relations with learning effects on the paper test score. Learning effects showed differences by learning style. These findings indicated that the learner's characteristics should be considered in the design and development of more effective WBI environments.

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Consumer's Product Knowledge and Information Search related to Clothing (소비자 의류 제품 지식과 외적 정보 탐색 활동에 관한 연구)

  • 이지연;박재옥
    • Journal of the Korean Society of Clothing and Textiles
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    • v.21 no.3
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    • pp.641-654
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    • 1997
  • The purpose of this study is to investigate the relationship between the consumer's product knowledge and his/her ability to obtain information when buying clothing. For the purpose of this study, questionnaires were given to 550 university students living in Seoul and the Kwgi area. The questionnaires were designed to measure the consumer's knowledge about examine his/her method of gathering information and to obtain some personal information Vsing a base of 407 students, data was analyzed through cross- tabulation, the chi square test, the t-test, the one-way ANOVA accompanied by a post-hoc analysis with the Tukey method, Pearson's correlation coefficient, and the Spearman rho. The results of this study were as follows. 1) There was a significant difference in the amount of iuormation seeking between groups with different knowledge related to clothing. 2) The use of information sources was found to be significantly related to the consumer's subjective and objective knowledge. 3) The consumer's level of knowledge about clothing was related to the store characteristics that he/she took into consideration. The difference between the groups came from the number of store characteristics taken into consideration, rather than from the contents. The group that had more knowledge related to clothing was more aware of store characteristics than the other level stoup. Price, quality, uniqueness, and variety of clothing were equally important to by groups. 4) A moderate relationship was found between the consumer's subjective and objective knowledge, and between his/her purchasing experience and objective knowledge. There was a relatively high relationship between purchasing experience and subjective knowledge.

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Assessment for Detecting Trend using Empirical Mode Decomposition Method (경험적 모드분해법을 활용한 경향성 분석의 적용성 평가)

  • Kim, Taereem;Choi, Wonyoung;Seo, Jungho;Heo, Jun-Haeng
    • Proceedings of the Korea Water Resources Association Conference
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    • 2016.05a
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    • pp.232-232
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    • 2016
  • 주어진 시계열 자료의 경향성을 분석하고 판별하는 것은 수문 자료의 분석에서 가장 우선적으로 수행되어야 할 절차이며 경향성의 유무에 따라 자료를 분석하는 방법이 달라지게 되므로 매우 중요한 부분이다. 일반적으로 국내에서 주로 사용되는 수문 시계열 자료의 경향성 분석 방법으로는 비매개변수적인 방법인 Mann-Kendall test, Spearman's rho test, Hotelling Pabst test, Sentest 등이 있으며 그 중에서도 국내외 수문 자료의 경향성 분석에는 비교적 높은 기각력을 보이는 Mann-Kendall test가 주된 방법으로 활용되어 오고 있다. Mann-Kendall test는 통계적 유의성을 바탕으로 한 경향성 판별 방법으로 시계열 자료 내에 존재하는 경향성의 형태를 분석하여 경향성 유무를 판별하는 것에는 한계가 있다. 경험적 모드분해법을 활용한 경향성 분석 방법은 체거름 과정을 통하여 주어진 시계열 자료를 내재모드함수로 분해한 후, 추출된 모든 요소를 제거하고 남은 잔여값의 형태를 이용하여 경향성 유무를 판별하는 방법으로 자료에 내재된 경향성의 형태를 확인할 수 있는 장점을 가지고 있다. 본 연구에서는 이러한 경험적 모드분해법을 이용한 경향성 분석 방법을 소개하고, 모의를 통한 시계열 자료를 이용하여 경향성 분석에 적용한 후 기존에 사용되어온 Mann-Kendall test와의 비교를 통해 적용성을 평가하였다.

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