体育院校学生生涯决策自我效能的跨组分析

目的:考察《大学生生涯决策自我效能问卷》在我国体育院校大学生人群的适用性,比较该人群生涯决策自我效能水平在专业类别和年级上的差异。方法:运用上述工具对1,740名体育院校大学生施测,采用验证性因素分析及Cronbachα系数考察该工具使用的效度和信度,在检验测量恒等性基础上,进一步跨组比较分析专业类别和年级的差异,并对体育院校系毕业生、各年级学生与普通高校学生的生涯决策自我效能进行平均数差异性检验。结果:二阶因素模型的拟合指数良好,各条目的因素负载在0.44～0.69间,均达到显著性水平,各分量Cronbachα系数在0.80～0.85间。各单样本生涯决策自我效能结构形态恒等,跨母群因素恒等模型可以接受。体艺类专业与非体艺类专业大学生在生涯决策自我效能上无显著差异,大四毕业生的水平著低于其他年级学生。体育院校学生的生涯决策自我效能与当前普通高校学生无显著差异,但大四学生的水平显著低于九年前普通高校毕业生水平。结论:这一测量工具适用于测量我国体育院校大学生生涯决策自我效能的水平,专业类别并不影响体育院校系大学生的生涯决策自我效能,这进一步证明生涯决策自我效能是一个与专业类别关联不大的概念结构。与同时期其他普通高校大学生一样,体育院校系毕业生临近就业,生涯自我效能水平明显低于低年级学生,这一现状与过去、国外状况不同。     

Two-Step Approach to Partial Factorial Invariance: Selecting a Reference Variable and Identifying the Source of Noninvariance

To date, no effective empirical method has been available to identify a truly invariant reference variable (RV) in testing measurement invariance under a multiple-group confirmatory factor analysis. This study proposes a method that, in selecting an RV, uses the smallest modification index (min-mod). The method’s performance is evaluated using 2 models: (a) a full invariance model, and (b) a partial invariance model. Results indicate that for both models the min-mod successfully identifies a truly invariant RV (Study 1). In Study 2, we use the RV found in Study 1 to further evaluate the performance of item-by-item Wald tests at locating a noninvariant variable. The results indicate that Wald tests overall performed better with an RV selected in a partial invariance model than an RV selected in a full invariance model, although in certain conditions their performances were rather similar. Implications and limitations of the study are also discussed.     

Sensitivity of the Soccer Defending Skill Scale: A comparison between teams

Abstract

The aim of the present study was to examine the sensitivity of the Soccer Defending Skill Scale (SDSS) using multiple-group analysis and a structured mean model. The data were 469 defending performances in the finals of the FIFA World Cup Korea/Japan 2002^TM, which were measured as distances, angles between attackers and defenders, and the number of players using 6-point interval scales. The results of multiple-group analysis indicated that the model, which had factor loading, intercept and factor correlation, and F3/F4/F6 variances invariant across Brazil and Germany, represented the best fit to the data (e.g. Tucker-Lewis index = 1.001, confirmatory fit index = 1.000, root mean square error of approximation = 0.000). Furthermore, the latent mean model comparison between teams revealed significant differences in latent mean with respect to “defence to attackers without the ball” (Brazil < Germany). We conclude that our results provide strong support for the sensitivity of the SDSS.     

Examining factorial validity and measurement invariance of the Student-Teacher Relationship Scale

The purposes of this study were to (a) test the hypothesized factor structure of the Student-Teacher Relationship Scale (STRS; Pianta, 2001) for 308 African American (AA) and European American (EA) children using confirmatory factor analysis (CFA) and (b) examine the measurement invariance of the factor structure across AA and EA children. CFA of the hypothesized three-factor model with correlated latent factors did not yield an optimal model fit. Parameter estimates obtained from CFA identified items with low factor loadings and R² values, suggesting that content revision is required for those items on the STRS. Deletion of two items from the scale yielded a good model fit, suggesting that the remaining 26 items reliably and validly measure the constructs for the whole sample. Tests for configural invariance, however, revealed that the underlying constructs may differ for AA and EA groups. Subsequent exploratory factor analyses (EFAs) for AA and EA children were carried out to investigate the comparability of the measurement model of the STRS across the groups. The results of EFAs provided evidence suggesting differential factor models of the STRS across AA and EA groups. This study provides implications for construct validity research and substantive research using the STRS given that the STRS is extensively used in intervention and research in early childhood education.     

Grade-Level Invariance of a Theoretical Causal Structure Predicting Reading Comprehension With Vocabulary and Oral Reading Fluency

This research investigates the relative importance of vocabulary and oral reading fluency as measurement dimensions of reading comprehension as the student passes from elementary to high school. Invariance of this model over grades 4 through 8 is tested using two independent student samples reading grade-level appropriate passages. Results from structural equation modeling indicate that the model is not invariant across grade levels. Vocabulary knowledge is a significant and constant predictor of overall reading comprehension irrespective of grade level. While significant, fluency effects diminish over grades, especially in the later grades. Lack of grade level invariance was obtained with both samples. Results are discussed in light of vertically linked reading assessments, adequate yearly progress, and instruction.     

Information theory of metasurfaces

We propose a theory to characterize the information and information processing abilities of metasurfaces, and demonstrate the relation between the information of the metasurface and its radiation pattern in the far-field region. By incorporating a general aperture model with uncertainty relation in L²-space, we propose a theory to predict the upper bound of information contained in the radiation pattern of a metasurface, and reveal the theoretical upper limit of orthogonal radiation states. The proposed theory also provides guidance for inverse design of the metasurface with respect to given functionalities. Through investigation of the information of disordered-phase modulated metasurfaces, we find the information invariance (1−γ, where γ is Euler''s constant) of chaotic radiation patterns. That is to say, the information of the disordered-phase modulated radiation patterns is always equal to 1−γ, regardless of variations in size, the number of elements and the phase pattern of metasurface. This value might be the lower bound of radiation-pattern information of the metasurface, which can provide a theoretical limit for information modulation applications, including computational imaging, stealth technologies and wireless communications.     

Using multi-group confirmatory factor analysis to evaluate cross-cultural research: identifying and understanding non-invariance

Multi-group confirmatory factor analysis (MGCFA) allows researchers to determine whether a research inventory elicits similar response patterns across samples. If statistical equivalence in responding is found, then scale score comparisons become possible and samples can be said to be from the same population. This paper illustrates the use of MGCFA by examining survey results relating to practising teachers' conceptions of feedback in two very different jurisdictions (Louisiana, USA, n?=?308; New Zealand, n?=?518), highlighting challenges which can occur when conducting this kind of cross-cultural research. As the two contexts had very different policies and practices around educational assessment, it was considered possible that a common research inventory may elicit non-equivalent responding, leading to non-invariance. Independent models for each group and a joint model for all participants were tested for invariance using MGCFA and all were inadmissible for one of the two groups. Inspection of joint model differences in item loadings, scale reliabilities, and scale inter-correlations established the extent of non-invariance. This paper discusses the implications of non-invariance within this particular study and identifies difficulties in using an inventory in cross-cultural settings. It also provides suggestions about how to increase the likelihood that a common factor structure can be recovered.     

青少年积极发展的新视角: 意向性自我调节

旨在检验选择优化补偿问卷(selection,optimization and compensation questionnaire, SOC)在不同性别的青少年群体中的测量等值性,并检验该问卷在青少年中跨时间的测量等值性。方法采用SOC问卷,对湖南省4所中学的2 568名青少年进行施测,并对总样本中的590名青少年的意向性自我调节进行前后两次的追踪调查,两次施测间隔时间为6个月。对调查数据进行多组验证性因素分析比较,结果显示SOC问卷在不同性别青少年和不同时间点的测量等值和结构等值均可被接受。结果证明SOC问卷的三因子结构在青少年男生和女生之间具有完全因素等值,并且具有跨时间的完全因素等值。     

Measurement Invariance Testing Across Between-Level Latent Classes Using Multilevel Factor Mixture Modeling

This simulation study examines the efficacy of multilevel factor mixture modeling (ML FMM) for measurement invariance testing across unobserved groups when the groups are at the between level of multilevel data. To this end, latent classes are generated with class-specific item parameters (i.e., factor loading and intercept) across the between-level classes. The efficacy of ML FMM is evaluated in terms of class enumeration, class assignment, and the detection of noninvariance. Various classification criteria such as Akaike’s information criterion, Bayesian information criterion, and bootstrap likelihood ratio tests are examined for the correct enumeration of between-level latent classes. For the detection of measurement noninvariance, free and constrained baseline approaches are compared with respect to true positive and false positive rates. This study evidences the adequacy of ML FMM. However, its performance heavily depends on the simulation factors such as the classification criteria, sample size, and the magnitude of noninvariance. Practical guidelines for applied researchers are provided.     

基于光电混合系统的家用机器人视觉系统

指出家用机器人比工业机器人将具有更广泛的应用前景。构建一种基于光电混合系统的家用机器人的视觉系统,以联合变换相关器实现目标图像的平移不变性,以综合判别函数和WTA网络构成级联式神经网络实现目标图像的畸变不变性。讨论整个系统的原理及其实施方案,论证其可行性,为家用机器人提供了一种有效的多目标实时模式识别方法。