• 제목/요약/키워드: set of covariate variables

검색결과 6건 처리시간 0.022초

Semi-Partial Canonical Correlation Biplot

  • Lee, Bo-Hui;Choi, Yong-Seok;Shin, Sang-Min
    • 응용통계연구
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    • 제25권3호
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    • pp.521-529
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    • 2012
  • Simple canonical correlation biplot is a graphical method to investigate two sets of variables and observations in simple canonical correlation analysis. If we consider the set of covariate variables that linearly affects two sets of variables, we can apply the partial canonical correlation biplot in partial canonical correlation analysis that removes the linear effect of the set of covariate variables on two sets of variables. On the other hand, we consider the set of covariate variables that linearly affect one set of variables but not the other. In this case, if we apply the simple or partial canonical correlation biplot, we cannot clearly interpret other two sets of variables. Therefore, in this study, we will apply the semi-partial canonical correlation analysis of Timm (2002) and remove the linear effect of the set of covariate variables on one set of variables but not the other. And we suggest the semi-partial canonical correlation biplot for interpreting the semi-partial canonical correlation analysis. In addition, we will compare shapes and shape the variabilities of the simple, partial and semi-partial canonical correlation biplots using a procrustes analysis.

편정준상관 행렬도 (Partial Canonical Correlation Biplot)

  • 염아림;최용석
    • 응용통계연구
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    • 제24권3호
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    • pp.559-566
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    • 2011
  • 행렬도는 이원표 자료행렬의 행과 열을 탐색하기에 유용한 그래프적 방법이다. 특히, 정준상관 행렬도는 정준상관분석의 결과를 이용하여 두 변수군과 개체간의 관계를 기하적으로 살펴볼 수 있다. 그 반면에 자료의 성격에 따라 세개 이상의 변수군이 존재하는 경우에는 정준상관분석의 개념에서 확장한 일반화 정준상관분석을 이용하여 일반화 정준상관 행렬도를 고려할 수 있다. 그러나 자료의 성격에 따라 두 변수군 외에 이들 두 변수군에 선형적 영향을 미치는 공변량변수로 이루어진 다른 한 변수군이 존재하는 경우에, 일반화 정준상관 행렬도를 적용한다면 공변량변수군의 영향력 때문에 주 관심인 두 변수군에 대하여 잘못 해석할 수 있다. 따라서 본 연구에서는 Rao (1969)의 공변량 변수군의 영향력을 제거한 편정준상관분석을 살펴보고, 이를 기하적으로 해석하기 위한 편정준상관 행렬도를 제안한다.

공변량요인 효과를 제거한 편정준상관 행렬도와 프로크러스티즈 분석을 응용한 남자 테니스선수의 체력요인 및 기초기술요인에 대한 분석연구 (Relationship between Physical Fitness and Basic Skill Factors for KTA Players Using the Partial Cannonical Correlation Biplot Removing the Linear Effect of the Set of Covariate Variables and Procrustes Analysis)

  • 최태훈;최용석
    • Communications for Statistical Applications and Methods
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    • 제19권1호
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    • pp.97-105
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    • 2012
  • 일반화 정준상관 행렬도(generalized canonical correlation biplot)는 정준상관분석에서 세 변수군 이상에 의해서 측정된 다변량 자료에서 변수 집단 간의 관계와 개체들의 관계를 탐색하기 위한 2차원 그림이다. 최근에 이를 활용하여 최태훈과 최용석 (2010)은 2004년 대한테니스협회(KTA)에 등록된 남자선수들 중 상위 50명을 대상으로 세 변수군인 체격요인변수군, 체력요인변수군 그리고 기초기술요인변수군의 상호 연관성을 살펴보았다. 그러나 이들 분석에서 체격요인변수군이 나머지 두 변수군과 독립적이지 못하고 선형적 영향을 미치는 것으로 판단되어 이를 공변량변수군으로 고려하였다. 이와같이 세 변수군에서 한 변수군이 공변량(covariate)으로 영향을 주는 경우 이를 제거한 정준상관분석을 편(partial)정준상관분석이라 하며 이와 관련된 편정준상관 행렬도를 염아림과 최용석 (2011)은 제안하였다. 본 연구에서는 최태훈과 최용석(2010)의 분석에서 체격요인변수군의 영향을 제거하고 체력요인변수군과 기초기술요인변수군의 관계를 살펴보는 편정준상관 행렬도의 활용의 예를 보이고 기존 연구의 일반화 정준상관 행렬도, 편정준상관 행렬도, 정준상관 행렬도의 결과를 서로 비교하고자 한다. 덧붙여 이들 행렬도간의 형상변동 차이를 프로크러스티즈 분석을 활용하여 비교하고자 한다.

Latent class analysis with multiple latent group variables

  • Lee, Jung Wun;Chung, Hwan
    • Communications for Statistical Applications and Methods
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    • 제24권2호
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    • pp.173-191
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    • 2017
  • This study develops a new type of latent class analysis (LCA) in order to explain the associations between one latent variable and several other categorical latent variables. Our model postulates that the prevalence of the latent variable of interest is affected by another latent variable composed of other several latent variables. For the parameter estimation, we propose deterministic annealing EM (DAEM) to deal with local maxima problem in the proposed model. We perform simulation study to demonstrate how DAEM can find the set of parameter estimates at the global maximum of the likelihood over the repeated samples. We apply the proposed LCA model in an investigation of the effect of and joint patterns for drug-using behavior to violent behavior among US high school male students using data from the Youth Risk Behavior Surveillance System 2015. Considering the age of male adolescents as a covariate influencing violent behavior, we identified three classes of violent behavior and three classes of drug-using behavior. We also discovered that the prevalence of violent behavior is affected by the type of drug used for drug-using behavior.

Study on the Effects of Tetrax®-based Combined Rehabilitation Exercise on Chronic Back Pain Cases

  • Park, Jae-Yong;Lee, Jung-Chul;Cheon, Min-Woo
    • Transactions on Electrical and Electronic Materials
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    • 제15권3호
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    • pp.144-148
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    • 2014
  • The purpose of this research is to utilizing the Tetrax$^{(R)}$ balance measuring instrument in order to analyze the postural balance of males and females in their 30 s diagnosed with chronic lower back pain who have followed a 12-week rehabilitation exercise program. The research also examines the effects on any change in back pain level. In terms of the variables in this research, postural balance (left/right, front/back, postural balance) and pain level change (0~100 mm) were measured. Pre-/post-experimental differences were assessed using the paired-t test. In addition, to identify any gender gap, we set the preliminary scores as a covariate and ran the Analysis of Covariance. Statistical significance (a) herein was set at 0.05. As a result of this research experiment, the left/right, front/back, and overall postural balance were found to increase in both the male and female cases, but with no statistical significance or gender gap. However, both males and females showed a significant decrease in their back pain levels. These findings demonstrate the necessity of continuing clinical research based on the Tetrax$^{(R)}$ equipment for scientific evaluation of the effects of rehabilitation exercises on chronic lower back pain patients and their balancing ability.

Evaluating the efficiency of treatment comparison in crossover design by allocating subjects based on ranked auxiliary variable

  • Huang, Yisong;Samawi, Hani M.;Vogel, Robert;Yin, Jingjing;Gato, Worlanyo Eric;Linder, Daniel F.
    • Communications for Statistical Applications and Methods
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    • 제23권6호
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    • pp.543-553
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    • 2016
  • The validity of statistical inference depends on proper randomization methods. However, even with proper randomization, we can have imbalanced with respect to important characteristics. In this paper, we introduce a method based on ranked auxiliary variables for treatment allocation in crossover designs using Latin squares models. We evaluate the improvement of the efficiency in treatment comparisons using the proposed method. Our simulation study reveals that our proposed method provides a more powerful test compared to simple randomization with the same sample size. The proposed method is illustrated by conducting an experiment to compare two different concentrations of titanium dioxide nanofiber (TDNF) on rats for the purpose of comparing weight gain.