• 제목/요약/키워드: Test of Homogeneity

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The maximum likelihood estimation and testing of gene frequencies of generalized ABO-like blood group systems (일반화된 ABO-식 혈액형의 유전자 빈도에 대한 최우추정 및 검정)

  • 이준영;신한풍
    • The Korean Journal of Applied Statistics
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    • v.2 no.1
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    • pp.35-47
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    • 1989
  • This article deals with the method of ML among the methods of estimating m gene frequenecies in the Generalized ABO-like Blood Group Systems and with the statistical testing about the differencies of gene frequencies by using these estimators. Especially, the generalization about the Homogeneity testing problem is tried and thus it enables us to test of Homogeneity of m gene frequencies. Finally, in the example, ML estimator is compared with other estimators suggested by Bernstein method, by adjusted Bernstein method and by modified Bernstein method, and statistical testing in the above is carried out by using orthogonal partitioning.

A Correlation Research of Digestion According to Sasang Constitution (소화에 관한 체질별 상관성 연구)

  • Baek, Tae-Ho;Choi, Jeong-Rak;Park, Seong-Sik
    • Journal of Sasang Constitutional Medicine
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    • v.16 no.1
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    • pp.112-119
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    • 2004
  • Objectives This paper was designed for studying the features of digestion according to Sasang Constitution and to be helpful to make a diagnosis Sasang Constitution. Using the result of this study, it will be helpful to diagnose a Sasang constitution. Methods There were 588 patients(248 men, 340 women) who answered questionnaire and were diagnosed by the Sasang Constitution Specialist at Constitutional Clinic of Dongguk Bundang Oriental Hospital. Using the response of questionnaire and several statistical techniques such as homogeneity test and multiple comparison, we tried to find the characteristics of each constitution depending on its dining behavior. Results As a result of the analysis of questionnaire, Taeumin and Soyangin answered to 'Because digestion is well, I overeat frequently' many more than Soeumin(p<0.01). Soeumin answered to 'When I eat cold food or greasy food, it hardly digests' many more than Taeumin(p<0.05). Soeumin and Taeyangin answered to 'Because I have indigestion, I have suffered from infancy' many more than Taeumin(p<0.01). Soeumin answered to 'I have easily a digestive upset' many more than Taeumin(p<0.01). Soeumin answered to 'indigestion in case of paying attention' many more than Taeumin and Soyangin(p<0.01).

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A Clinical Study of Sleep According to Sasang Constitution (사상체질에 따른 수면의 특징에 대한 연구)

  • Park, Seong-Sik;Choi, Jeong-Rak
    • Journal of Sasang Constitutional Medicine
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    • v.15 no.3
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    • pp.204-215
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    • 2003
  • Objectives : This paper was for studying the features of sleep according to Sasang Constitution and to be helpful to make a diagnosis Sasang Constitution. Using the result of this study, it will be helpful to diagnose a Sasang constitution. Methods : There were 610 patients(258 men, 352 women) who answered questionnaire and were diagnosed by the Sasang Constitution Specialist at Constitutional Clinic of Dongguk Bundang Oriental Hospital. Using the response of questionnaire and several statistical techniques such as homogeneity test and multiple comparison, we tried to find the characteristics of each constitution depending on its sleep behaviors. 3. Results : As a result of the analysis of questionnaire, Soeumin has many dreams in comparison with other constitution(p<0.01). Taeumin and Soyangin have a few dream in comparison with Soeumin(p<0.01). Taeyangin has a characteristic that 'he is not drowsy comparatively, he awakes easily, he is not drowsy if it is cold, he is not drowsy and has many dreams if he has many stress.(p<0.01) Taeumin has a characteristics that 'he has a few dream in ordinary times'(p<0.01).

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A Study for the Weldability, Welding Position and Welded Joint Performance on the FCAW of HSA800 Steel (HSA800 강재의 FCAW 용접성, 용접자세 및 이음성능 연구)

  • Lee, Eun Taik;Kim, Jong Rak;Choi, Young Han;Kim, Sang Seup
    • Journal of Korean Society of Steel Construction
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    • v.28 no.4
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    • pp.281-292
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    • 2016
  • In this research, 10 specimens of FCAW welding with positions of 1G and 3G were tested to confirm the weldability, welding positions, and welded joint performance of 60mm HSA800 steel. The test results showed that FCAW 1G and 3G satisfied HSA800 steel's KS and the criteria for homogeneity of strength, indicating a good weld zones. However, according to the tensile test results of weld zone, 3G position FCAW welding requires improvement of welding techniques and methods.

The Effects of Foot Reflexology on ADL and Fatigue in Stroke Patients (발반사요법이 뇌졸중환자의 일상생활동작과 피로에 미치는 효과)

  • Song, Mi-Ryeong;Song, Hyeong-Mi
    • The Korean Journal of Rehabilitation Nursing
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    • v.8 no.2
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    • pp.139-148
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    • 2005
  • Purpose: This study was to examine the effects of foot reflexology on ADL and fatigue in stroke patients. Method: The subjects were 31 stroke patients hospitalized in the Oriental Medicine Hospital of D University from June to November, 2002. Foot reflexology was applied to the experimental group twice a week for 6 weeks, 40 minutes each. For the data analysis, $x^2$-test was conducted to verify the homogeneity of general characteristics and clinical characteristics, and t-test was done to verify the homogeneity of ADL and fatigue. To examine the relative efficacy of the intervention, ANOVA and ANCOVA were conducted. Results: After foot reflexology, the subjects in the experimental group showed significant improvement in ADL. They also had less physical, psychological, and neurosensory fatigue, which are three areas of fatigue. Conclusion: The results suggest that foot reflexology is an effective intervention that helps the body work efficiently, eases stress and strain, and enhances the homeostasis of the body through stimulating the reflex zone of internal organs in the body. Therefore, it is necessary to develop foot reflexology as an unique nursing intervention.

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Likelihood Ratio Test for the Equality of Two Order Restricted Normal Mean Vectors

  • Jeon Hyojin;Choi Sungsub
    • Proceedings of the Korean Statistical Society Conference
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    • 2000.11a
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    • pp.159-164
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    • 2000
  • In the study of the isotonic regression problem, several procedures for testing the homogeneity of a normal mean vector versus order restricted alternatives have been proposed since Barlow's trial(1972). In this paper, we consider the problem of testing the equality of two order restricted normal mean vectors based on the likelihood ratio principle.

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A simple test method to assess slump flow and stability of self-compacting concrete

  • Bouziani, Tayeb
    • Computers and Concrete
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    • v.21 no.2
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    • pp.111-116
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    • 2018
  • Establishment of test methods to assess the fresh properties of self-compacting concrete (SCC) are required to ensure the homogeneity in fresh and hardened states. This paper discusses the suitability of a simple test method for assessing the slump flow and stability of SCC by testing on self-compacting mortar (SCM) fraction. The proposed test method aims at investigating slump flow diameter test and sieve stability test of SCC by testing SCM fraction with a plunger penetration apparatus. A central composite modeling design was performed to evaluate the effects of water/cement ratio (W/C), superplasticizer dosage (SP) and powder marble content (MP) on slump flow diameter, stability and plunger penetration test of fresh SCC. The responses of the derived statistical models are slump flow (Sf), sieve stability (S) and plunger penetration (P). Relationships obtained in this study show acceptable correlations between plunger penetration test value and slump flow diameter test results and stability. It should note that the developed relationships are very useful to predict slump flow diameter and stability of studied SCC mixtures by carrying out a simple plunger penetration test on its mortar, which can save labour and time in laboratory experiments.

Hypothesis Testing: Means and Proportions (평균과 비율 비교)

  • Pak, Son-Il;Lee, Young-Won
    • Journal of Veterinary Clinics
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    • v.26 no.5
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    • pp.401-407
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    • 2009
  • In the previous article in this series we introduced the basic concepts for statistical analysis. The present review introduces hypothesis testing for continuous and categorical data for readers of the veterinary science literature. For the analysis of continuous data, we explained t-test to compare a single mean with a hypothesized value and the difference between two means from two independent samples or between two means arising from paired samples. When the data are categorical variables, the $x^2$ test for association and homogeneity, Fisher's exact test and Yates' continuity correction for small samples, and test for trend, in which at least one of the variables is ordinal is described, together with the worked examples. McNemar test for correlated proportions is also discussed. The topics covered may provide a basic understanding of different approaches for analyzing clinical data.

Estimating design floods for ungauged basins in the geum-river basin through regional flood frequency analysis using L-moments method (L-모멘트법을 이용한 지역홍수빈도분석을 통한 금강유역 미계측 유역의 설계홍수량 산정)

  • Lee, Jin-Young;Park, Dong-Hyeok;Shin, Ji-Yae;Kim, Tae-Woong
    • Journal of Korea Water Resources Association
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    • v.49 no.8
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    • pp.645-656
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    • 2016
  • The study performed a regional flood frequency analysis and proposed a regression equation to estimate design floods corresponding to return periods for ungauged basins in Geum-river basin. Five preliminary tests were employed to investigate hydrological independence and homogeneity of streamflow data, i.e. the lag-one autocorrelation test, time homogeneity test, Grubbs-Beck outlier test, discordancy measure test ($D_i$), and regional homogeneity measure (H). The test results showed that streamflow data were time-independent, discordant and homogeneous within the basin. Using five probability distributions (generalized extreme value (GEV), three-parameter log-normal (LN-III), Pearson type 3 (P-III), generalized logistic (GLO), generalized Pareto (GPA)), comparative regional flood frequency analyses were carried out for the region. Based on the L-moment ratio diagram, average weighted distance (AWD) and goodness-of-fit statistics ($Z^{DIST}$), the GLO distribution was selected as the best fit model for Geum-river basin. Using the GLO, a regression equation was developed for estimating regional design floods, and validated by comparing the estimated and observed streamflows at the Ganggyeong station.

Derivation of Optimal Design Flood by L-Moments and LB-Moments ( I ) - On the method of L-Moments - (L-모멘트 및 LH-모멘트 기법에 의한 적정 설계홍수량의 유도( I ) - L-모멘트법을 중심으로 -)

  • 이순혁;박명근;맹승진;정연수;김동주;류경식
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.40 no.4
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    • pp.45-57
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    • 1998
  • This study was conducted to derive optimal design floods by Generalized Extreme Value (GEV) distribution for the annual maximum series at ten watersheds along Han, Nagdong, Geum, Yeongsan and Seomjin river systems. Adequacy for the analysis of flood data used in this study was established by the tests of Independence, Homogeneity, detection of Outliers. L-coefficient of variation, L-skewness and L-kurtosis were calculated by L-moment ratio respectively. Parameters were estimated by the Methods of Moments and L-Moments. Design floods obtained by Methods of Moments and L-Moments using different methods for plotting positions in GEV distribution were compared by the Relative Mean Errors(RME) and Relative Absolute Errors(RAE). The results were analyzed and summarized as follows. 1. Adequacy for the analysis of flood data was acknowledged by the tests of Independence, Homogeneity and detection of Outliers. 2. GEV distribution used in this study was found to be more suitable one than Pearson type 3 distribution by the goodness of fit test using Kolmogorov-Smirnov test and L-Moment ratios diagram in the applied watersheds. 3. Parameters for GEV distribution were estimated using Methods of Moments and L-Moments. 4. Design floods were calculated by Methods of Moments and L-Moments in GEV distribution. 5. It was found that design floods derived by the method of L-Moments using Weibull plotting position formula in GEV distribution are much closer to those of the observed data in comparison with those obtained by method of moments using different formulas for plotting positions from the viewpoint of Relative Mean Errors and Relative Absolute Errors.

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