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1.
利用多元统计中的典型相关分析方法 ,对流化床生物质气化工艺中的 4个生产条件及11个生成指标进行了较全面的分析 ,找出了影响热值、热效率的主要因素 .为流化床生物质气化工艺提供了一个科学合理的实施方案 .  相似文献   

2.
This article illustrates the relation between structural equation modeling (SEM) and canonical correlation analysis (CCA). The representation of CCA in SEM may provide some important interpretive information that is not available from conventional CCA, that is, statistical tests for the canonical function and index coefficients, and statistical tests for individual canonical functions. Hierarchically, the relation between the two analytic approaches suggests that SEM stands to be a more general analytic approach. For researchers interested in these techniques, an understanding of the interrelation among them can be helpful to our choice of analytic method.  相似文献   

3.
Are some students advantaged when changing multiple-choice answers? The authors of this investigation assessed the importance of an examinee's cognitive style in the answer-changing process. Two separate studies were conducted using undergraduates (n = 125 and n = 84). One set of variables consisted of a measure of field dependence/field independence, a measure of impulsivity/reflectivity, and an introductory psychology unit examination made up of multiple-choice items. A second set of variables was formed by gathering two answer-changing scores for each subject using the scannable forms from the unit examination—one reflecting the effect of answer changes and the other representing the number of changes. Canonical correlation analysis was used to describe the relationship between the two sets of variables. Only the first canonical correlation coefficient was statistically significant in each study. The structure coefficients indicated that the cognitive-style variables had little impact on the canonical solution and that a combination of the effect of answer changes, the number of changes, and unit examination scores were the most influential components of the first canonical variates.  相似文献   

4.
We used canonical correlation analysis to examine the predictive nature of three facets of wellness (mindfulness, emotion regulation, and perceived social support) on burnout in counselors-in-training (N = 136). The cognitive reappraisal construct made a significant contribution to the wellness predictor variate. Implications for counselor training programs are discussed.  相似文献   

5.
Abstract

The usefulness of the ACT and 16 PF for discriminating between decided and undecided college students was investigated. Different discriminant functions were derived for males and females, indicating a need for different counseling procedures. A canonical correlation analysis of the ACT versus the 16 PF indicated a strong relationship between the two instruments, even though redundancies were low. Six factors emerged in a factor analysis of the ACT, 16 PF, sex, hours earned, GPA, and group: an academic potential factor, four personality factors, and a school achievement factor.  相似文献   

6.
Researchers are often interested in testing the effectiveness of an intervention on multiple outcomes, for multiple subgroups, at multiple points in time, or across multiple treatment groups. The resulting multiplicity of statistical hypothesis tests can lead to spurious findings of effects. Multiple testing procedures (MTPs) are statistical procedures that counteract this problem by adjusting p values for effect estimates upward. Although MTPs are increasingly used in impact evaluations in education and other areas, an important consequence of their use is a change in statistical power that can be substantial. Unfortunately, researchers frequently ignore the power implications of MTPs when designing studies. Consequently, in some cases, sample sizes may be too small, and studies may be underpowered to detect effects as small as a desired size. In other cases, sample sizes may be larger than needed, or studies may be powered to detect smaller effects than anticipated. This paper presents methods for estimating statistical power for multiple definitions of statistical power and presents empirical findings on how power is affected by the use of MTPs.  相似文献   

7.
This study examined whether college students' learning styles (LS) and thinking styles (TS) were interrelated, and if these could predict academic achievement. A total of 210 college students completed two inventories, one of LS (LSQ, Kolb), and the other of TS (MSG, Sternberg). The results of canonical correlation analysis revealed the presence of a moderate relationship between both types of styles. The results of regression analysis indicated that students' academic achievement was related to students' thinking styles. Students that prefer to work individually (Internal), that do not enjoy creating, formulating, and planning for problem solution (Legislative in a negative sense) and those that have adherence to existing rules and procedures (Executive) were those which obtained higher academic achievement. The implications of these findings for educational psychologists, which include assessment of LS and TS and the need to encourage thinking as an important part of the learning process, are discussed.  相似文献   

8.
Based on previous work by H. G. Murray, this study examined relationships between overt classroom teaching behaviors of college instructors and student ratings of teaching effectiveness. One hundred seven students who enrolled in six sections of an introductory psychology course rated instructors on 12 measures of teaching effectiveness and reported the frequencies of 20 observable, inclass teaching behaviors. Relationships between teaching behaviors and student ratings were examined by simple, multiple, and canonical correlation procedures. A complex pattern of relationships emerged. The canonical analysis revealed a two-dimensional structure consisting of instructor clarity and student-teacher rapport dimensions. Teaching behaviors loading on these dimensions were examined.  相似文献   

9.
Questions of whether hypothesized structure models are appropriate representations of the pattern of association among a group of variables can be addressed using a wide variety of statistical procedures. These procedures include covariance structure analysis techniques and correlation structure analysis techniques, in which covariance structure procedures are based on distribution theory for covariances, and correlation structure procedures are based on distribution theory for correlations. The present article provides an overview of standard and modified normal theory and asymptotically distribution-free covariance and correlation structure analysis techniques and also details Monte Carlo simulation results on the Type I and Type II error control as a function of structure model type, number of variables in the model, sample size, and distributional nonnormality. The present Monte Carlo simulation demonstrates clearly that the robustness and nonrobustness of structure analysis techniques vary as a function of the structure of the model and the data conditions. Implications of these results for users of structure analysis techniques are considered in the context of current software availability.  相似文献   

10.
This investigation reviewed 59 studies examining the utility of the Frostig Developmental Test of Visual Perception and the efficacy of the Frostig program for the development of visual perception. Meta‐analysis, statistical procedures for accumulating evidence, was the method used to evaluate research findings relating to both test and program. Findings indicated that neither the Frostig test nor the Frostig training program were advantageous. The Frostig test did not demonstrate sufficient association with reading ability to be a useful predictor; it proved less useful than other visual perceptual measures and revealed a large common variance with intelligence. Findings assessing the efficacy of Frostig training showed that it is not an effective intervention for improving either visual perceptual skills assessed by the test or academic achievement. It is concluded that the available research has demonstrated that the Frostig materials are not successful and should be questioned as primary methods of assessment and training in special education.  相似文献   

11.
In standard canonical correlation analysis （CCA）, the data from definite datasets are used to estimate their canonical correlation. In real applications, for example in bilingual text retrieval, it may have a great portion of data that we do not know which set it belongs to. This part of data is called unlabeled data, while the rest from definite datasets is called labeled data. We propose a novel method called regularized canonical correlation analysis （RCCA）, which makes use of both labeled and unlabeled samples. Specifically, we learn to approximate canonical correlation as if all data were labeled. Then, we describe a generalization of RCCA for the multi-set situation. Experiments on four real world datasets, Yeast, Cloud, Iris, and Haberman, demonstrate that, by incorporating the unlabeled data points, the accuracy of correlation coefficients can be improved by over 30%.  相似文献   

12.
This study aimed to adapt the Resilience Youth Development Module (RYDM) and assess its psychometric properties in terms of internal consistency and convergent validity in Greek elementary students. Participants (N = 346) completed a battery of self‐report questionnaires, including the RYDM, School Connectedness Scale, and Strengths and Difficulties Questionnaire. Cronbach's alpha coefficients indicated that the reliability of the RYDM is satisfactory. The confirmatory factor analysis results demonstrated that the proposed structure, which derived from the explorative principal component analyses of the RYDM's internal and external assets, adequately fit the current data. Moreover, the canonical functions derived from the canonical correlation analysis provided evidence for the convergent validity of the RYDM. In conclusion, the RYDM is a psychometrically sound measure, and it can be applied to assess internal and external resilience assets in Greek school‐aged children.  相似文献   

13.
Problem-solving and creativity measures were administered to 127 gifted New York City school children from grades 4–6, in an attempt to relate these cognitive variables to the affective traits of locus of control, self-esteem, and tolerance of ambiguity. A canonical correlation analysis indicated one significant canonical set (p <.05) in which 46% of the variability in a set of cognitive measures was explained by a set of affective measures. A factor analysis was performed on the creativity and problem-solving tasks, with two factors emerging: Fluency and Rearrangement. Factor scores were used to analyze sex and grade differences. Sex differences on the cognitive tasks were consistent with those reported in the literature. No sex differences were obtained on the affective tasks. Grade 4 students differed significantly from grade 6 students on the Rearrangement factor only. On the affective tasks, grade 4 students differed from both grade 5 and grade 6 students only on tolerance of ambiguity. Results were discussed in terms of the importance of affective personality traits in the creative and problem-solving process.  相似文献   

14.
A general discussion is undertaken to show how the rotation techniques of factor analysis can be used to clarify and interpret the results of multivariate analysis of variance and discriminant analysis. Two general methods of rotating are explained; direct rotation, where the variance of the canonical variates is attached to the canonical variate scores, and indirect rotation where the variance of the canonical variates is attached to the principal components of the hypothesis. Two reasons for rotating are discussed, one giving rise to a taxonomy of groups or levels of a multivariate analysis of variance, the other giving rise to a taxonomy of variables involved in a multivariate analysis of variance. Two examples are given: one, a particular variety of taxonomy of groups and the other, a taxonomy of variables or battery reduction scheme.  相似文献   

15.
Abstract

The relationship between 7 dimensions of self-perception and 6 dimensions of statistics anxiety was investigated using a canonical correlation analysis. Participants were 146 students enrolled in graduate-level research methodology courses. The first canonical function revealed that students with the lowest levels of perceived scholastic competence, perceived intellectual ability, and perceived creativity tended to have the highest levels of statistics anxiety associated with worth of statistics, interpretation anxiety, test and class anxiety, computational self-concept, fear of asking for help, and fear of the statistics instructor. A comparison of the standardized and structure coefficients suggests that perceived self-worth served as a suppressor variable. Implications of the findings are discussed.  相似文献   

16.
研究主要的目的是了解大陆员工对于台商所给予的工作环境、工作教育训练以及工作薪资福利满意度现况,次要是想要探讨大陆员工的特质和忠诚度与工作教育训练及工作薪资福利之间有正向的关联性。随着2008年元月1日大陆的劳动合同法开始实施,台商所需要成本负担大幅提高,有了基本工资的保障,提升了大陆员工的生活质量,也影响了民生意识抬头,使得员工懂得捍卫自己的权利,尽管因为政府法规的实施有了许多变革之余,发现在薪资福利与忠诚度上有显著关系,且工作教育训练对于公司的忠诚度也有了显著关系,表示了大陆地区的员工逐渐重视了公司制度体系。研究在大陆鞋厂对于管理阶层以及基层员工发放问卷,以Cronbachs α值检定量表的信度、利用单因子变数分析员工人口因素在薪资福利及教育训练之间的差异性,在运用回归分析验证本研究所提出之研究假说。大陆经济起飞,尽管后来的新兴投资企业渐渐往越南、印度尼西亚发展,大陆依然是企业眼中的一块大饼,丰沛的人力则是企业最大资源。  相似文献   

17.
The Wherry-Doolittle proceedure has been used for over 30 years to reduce the number of variables in a multiple correlation. This paper describes techniques for obtaining the same kind of reduction of number of variables in the cases of canonical correlation discriminant analysis and multivariate analysis of variance. Statistical tests comparable to those used in the Wherry-Doolittle procedure are cited.  相似文献   

18.
The jackknife and bootstrap methods are becoming increasingly popular in research. Although the two approaches have similar goals and use similar strategies, information is lacking with regard to the comparability of their results. In the present study, this issue was systematically investigated for a case of canonical correlation analysis. Bootstrap, jackknife, and Monte Carlo experiments were carried out for 4 sample sizes (n = 200, 100, 50, 20). The jackknife analyses were also varied as regards the number of jackknife observations deleted in each analysis. Some meaningful discrepancies were observed between the bootstrap and jackknife results, especially under small sample-size conditions. Based on the comparisons made with Monte Carlo estimates, the empirical results suggest that the bootstrap technique provides less biased and more consistent results than the jackknife technique does.  相似文献   

19.
This article discusses the effect of clustering on statistical tests conducted with school environment data. Because most school environment studies involve the collection of data from teachers nested within schools, the hierarchical nature to these data cannot be ignored. In particular, this article considers the influence of intraschool correlations on tests of statistical significance conducted with the individual teacher as the unit of analysis. Theory that adjusts t test scores for nested data in two-group comparisons is presented and applied to school environment data. This article demonstrates that Type I error rates inflate greatly as the intraschool correlation increases. Because data analysis techniques that recognise the clustering of teachers in schools are essential, it is recommended that either multilevel analysis or adjustments to statistical parameters be undertaken in school environment studies involving nested data.  相似文献   

20.
There is a paucity of systematic research on prediction of success at the tertiary education level for Asian students, despite the important role that universities play in Asian communities, and despite the increasing numbers of such students who are coming to the West to study. This study reviews evidence collected over the past ten to fifteen years, which relates to the issue of prediction of academic performance of Chinese students at an English-Language and Western-oriented university - the University of Hong Kong. This review is complemented by an analysis of data collected longitudinally over a five year period, using multiple regression, multiple correlation, path analysis and canonical correlation analyses. The results provide evidence of factors which are important in determining the ability of a student to adapt to the foreign cultural and language barriers that exist at this university. In particular, ability in English language and mathematics provides good and reasonably independent predictors of success. The data show the importance of considering the cultural background of students when assessing their aptitude for study, and offer information for Western universities regarding their admissions procedures for Chinese students.  相似文献   

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