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Bayesian methods have the potential for increasing power in mediation analysis (Koopman, Howe, Hollenbeck, & Sin, 2015; Yuan & MacKinnon, 2009). This article compares the power of Bayesian credibility intervals for the mediated effect to the power of normal theory, distribution of the product, percentile, and bias-corrected bootstrap confidence intervals at N ≤ 200. Bayesian methods with diffuse priors have power comparable to the distribution of the product and bootstrap methods, and Bayesian methods with informative priors had the most power. Varying degrees of precision of prior distributions were also examined. Increased precision led to greater power only when N ≥ 100 and the effects were small, N < 60 and the effects were large, and N < 200 and the effects were medium. An empirical example from psychology illustrated a Bayesian analysis of the single mediator model from prior selection to interpreting results. 相似文献
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Roy Levy 《Structural equation modeling》2013,20(4):663-685
Bayesian approaches to modeling are receiving an increasing amount of attention in the areas of model construction and estimation in factor analysis, structural equation modeling (SEM), and related latent variable models. However, model diagnostics and model criticism remain relatively understudied aspects of Bayesian SEM. This article describes and illustrates key features of Bayesian approaches to model diagnostics and assessing data–model fit of structural equation models, discussing their merits relative to traditional procedures. 相似文献
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Dynamic structural equation modeling (DSEM) is a novel, intensive longitudinal data (ILD) analysis framework. DSEM models intraindividual changes over time on Level 1 and allows the parameters of these processes to vary across individuals on Level 2 using random effects. DSEM merges time series, structural equation, multilevel, and time-varying effects models. Despite the well-known properties of these analysis areas by themselves, it is unclear how their sample size requirements and recommendations transfer to the DSEM framework. This article presents the results of a simulation study that examines the estimation quality of univariate 2-level autoregressive models of order 1, AR(1), using Bayesian analysis in Mplus Version 8. Three features are varied in the simulations: complexity of the model, number of subjects, and number of time points per subject. Samples with many subjects and few time points are shown to perform substantially better than samples with few subjects and many time points. 相似文献
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Rebekah Luo Rebecca Harding Barbara Galland Martin Sellbom Amelia Gill 《Early education and development》2013,24(7):947-970
ABSTRACTResearch Findings: Optimal sleep is important for children’s learning and development. Sleep disordered breathing (SDB) refers to a spectrum of conditions from simple snoring to obstructive sleep apnea that is common in childhood and interrupts sleep. We examined pathways between SDB and academic performance of children (N = 163, M age = 6.2 years) one year after school entry. Measures included parent questionnaire and clinical assessment of SDB, standardized tests and rating scales of cognitive and executive functioning, researcher-administered literacy and numeracy tasks, and teacher-reported academic performance. Structural equation modeling (SEM) revealed direct and indirect paths between SDB and poorer academic performance. In indirect models, children’s SDB severity score was significantly linked to poorer executive functioning (β = .38, p < .01) and negatively associated with nonverbal reasoning (β = ?.21, p < .01). Poorer executive functioning, in turn, was negatively related to the verbal composite (β = ?.61, p < .01), with verbal and nonverbal composites associated with academic performance (βs = .56, .27, respectively, p’s < .01). Practice or Policy: These findings point to the need for attention to SDB and its links to potential cognitive sequelae across early development. Practitioners equipped with knowledge of SDB symptoms can facilitate referral for appropriate consultation and evaluation. 相似文献
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Cheryl J. Dye Joel E. Williams Karen A. Kemper Francis A. McGuire Begum Aybar-Damali 《Educational gerontology》2013,39(11):788-798
A multidisciplinary team developed and pilot-tested a curriculum, delivered by trained lay educators, to increase self-efficacy for physical activity among elderly food stamp recipients. Curriculum development was guided by a comprehensive literature review. Process evaluation was used to revise the curriculum and to assess lay educator training and pilot test fidelity. Three hundred sixteen low-income older adults participated in curriculum development and pilot-testing activities. One hundred twenty four participants completed pretest/posttest impact evaluation surveys. The average age of participants was 75 years old with 55.28% having less than high school education. Significant increases in self-efficacy regarding walking most days (p = .0022), using exercise bands (p < .0001), being physically active to increase strength (p = .0012), being active without injury (p < .0001), being able to wear appropriate clothing and shoes (p < .0001), and getting information about community physical activity programs (p = .0007) were observed. Participants also endorsed higher ratings of general health at posttest (p < .0001). 相似文献
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Emmelien A. van der Scheer Hannah J. E. Bijlsma Cees A. W. Glas 《School Effectiveness & School Improvement》2019,30(1):30-50
ABSTRACTA Bayesian IRT-model approach was used to investigate the validity and reliability of student perceptions of teaching quality. Furthermore, the student perceptions were compared with ratings of teaching quality by external observers. Grade 4 students (n = 675) filled out a questionnaire that was used to measure their opinions about the lessons of their teachers. Three lessons of 39 teachers were recorded and rated by 4 raters. The analyses showed that student perception and lesson observation scales fit best in an 11-dimensional model, which was an indication of construct validity and discriminant validity. Student perception scales were reliable, although not all items contributed to the scales to the same extent. Student ratings and lesson observations scores generally correlated moderately (ranging from r = .18 to r = .50). Higher correlations were found for scales with a similar content; however, no clear pattern was apparent. Suggestions for future research are presented. 相似文献
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This study models graduation rates at 4-year broad access institutions (BAIs). We examine the student body, structural-demographic, and financial characteristics that best predict 6-year graduation rates across two time periods (2008–2009 and 2014–2015). A Bayesian model averaging approach is utilized to account for uncertainty in variable selection in modeling graduation rates. Evidence suggests that graduation rates can be predicted by religious affiliation, proportion of students enrolled full-time, socioeconomic status of the student body, enrollment size and institutional revenue and expenditures. Findings also demonstrate that relatively fewer variables predict institutional graduation rates for Latina/o and African American students at 4-year BAIs. We conclude with implications for policy and key recommendations for research focused on 4-year BAIs. 相似文献
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This Monte Carlo simulation adds to the growing body of enumeration index performance research in continuous response variable mixture models by addressing the issue of the performance of these indexes in discrete-time survival mixture analysis (DTSMA) models. Results showed that although all enumeration indexes performed very well in identifying a homogeneous DTSMA model (i.e., k = 1 hazard function in the sample data), the findings also showed that the enumeration indexes performed poorly in identifying the correct number of unobserved hazard functions present in a heterogeneous (i.e., k = 3) DTSMA model. More important, the performance of the enumeration indexes for the heterogeneous DTSMA models did not improve as the sample size, the effect of time-invariant covariates, or adjacent hazard function separation distance increased, which is inconsistent with some previous Monte Carlo simulation results. The limitations of this Monte Carlo simulation study and future empirical investigation possibilities are both discussed. 相似文献
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ABSTRACTReadability studies routinely report that resources with physical activity-related content exceed the eighth-grade reading level (RL), the maximum recommended for health education resources. The objectives of this meta-analysis were to determine the extent that findings in the literature represented true differences and whether production sources differed in their average RL. Fourteen studies met the study inclusion criteria. The main analysis involved 819 print and web article resources produced by government and nongovernment sources. The average RL was greater than eighth-grade (M = 10.25, 95% CI = [9.62, 10.91], p < .001), a nearly substantial magnitude of difference (g = .75), with a substantial percentage of the observed effects representing true differences (I2 = 79.79%). No differences were observed between productions sources, Q(5) = 2.56, p = .767. Publication bias and publication date did not meaningfully affect the main findings, nor did variations in study methodology or quality. The implications of these results for kinesiology are discussed and recommendations for future research are presented. 相似文献
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Pre-service teachers need experiences in practical matters as a part of field trip preparations programmes. For 14 years, a private, non-profit university in Turkey has involved pre-service teachers in field trip planning, implementation and evaluation. A programme assessment was conducted through a case study to examine the long-term effects of pre-service field trip preparation. Through a survey created for the study, teachers shared their field trip activities and reported confidence levels. The survey was administered to 44 alumni of the biology education department with a response rate of 72.7% (N = 32). This study will help researchers learn which programme areas need to be improved and can serve as a model for other institutions interested in evaluating field trip preparation programmes. 相似文献
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Model selection is important in any statistical analysis, and the primary goal is to find the preferred (or most parsimonious) model, based on certain criteria, from a set of candidate models given data. Several recent publications have employed the deviance information criterion (DIC) to do model selection among different forms of multilevel item response theory models (MLIRT). The majority of the practitioners use WinBUGS for implementing MCMC algorithms for MLIRT models, and the default version of DIC provided by WinBUGS focused on the measurement‐level parameters only. The results herein show that this version of DIC is inappropriate. This study introduces five variants of DIC as a model selection index for MLIRT models with dichotomous outcomes. Considering a multilevel IRT model with three levels, five forms of DIC are formed: first‐level conditional DIC computed from the measurement model only, which is the index given by many software packages such as WinBUGS; second‐level marginalized DIC and second‐level joint DIC computed from the second‐level model; and top‐level marginalized DIC and top‐level joint DIC computed from the entire model. We evaluate the performance of the five model selection indices via simulation studies. The manipulated factors include the number of groups, the number of second‐level covariates, the number of top‐level covariates, and the types of measurement models (one‐parameter vs. two‐parameter). Considering the computational viability and interpretability, the second‐level joint DIC is recommended for MLIRT models under our simulated conditions. 相似文献
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Andrew Kennedy 《Education 3-13》2013,41(2):217-218
According to the relevance of teacher attitudes in the teaching process as well as to the great number of discussions among experts of pre-school education, it was interesting to examine the students of pre-school teaching about their attitudes toward the use of computer among pre-school children. The sample consisted of N = 40 students from regular study and N = 37 students of irregular study of Pre-school education from Faculty of Teacher Education in Rijeka. Their attitudes have been investigated using an 18-item questionnaire created for the purposes of this study only. Overall, it was determined that future pre-school teachers have no clear and decisive general attitude toward the use of computer among pre-school children. In addition, they have shown from neutral to more positive attitudes according to all other items but with certain conditions. The discussion resulted with the recommendations for pre-school teacher’s education. 相似文献
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Jason L. Anthony Jeffrey M. Williams Zhoe Zhang Susan H. Landry Martha J. Dunkelberger 《Early education and development》2014,25(4):493-514
Research Findings: In an effort toward developing a comprehensive, effective, scalable, and sustainable early childhood education program for at-risk populations, we conducted an experimental evaluation of the value added by 2 family involvement programs to the Texas Early Education Model (TEEM). A total of 91 preschool classrooms that served minority populations of low socioeconomic status were randomly assigned to TEEM, TEEM plus Raising a Reader (RAR), or TEEM plus RAR augmented by Family Nights. Assessments of oral language and print knowledge were completed by more than 500 children at the beginning and end of the school year. Multilevel analyses of covariance controlled for classroom nesting and individual differences in age, ethnicity, and pretest scores. Although RAR alone demonstrated no added value, augmentation of RAR with Family Nights demonstrated significant impacts on measures of oral language (ts = 1.81–2.51, .05 < ps < .01) and print knowledge (t = 2.39, p < .01). Practice or Policy: Thus, parent training in shared reading practices appears to be necessary for children to benefit from programs that enrich the home literacy environment. That the combined program particularly benefited children who started preschool lagging behind in school readiness (ts = 1.64–2.49, ps < .05) suggests that this comprehensive model offers hope for closing the achievement gap. 相似文献
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We compare the accuracy of confidence intervals (CIs) and tests of close fit based on the root mean square error of approximation (RMSEA) with those based on the standardized root mean square residual (SRMR). Investigations used normal and nonnormal data with models ranging from p = 10 to 60 observed variables. CIs and tests of close fit based on the SRMR are generally accurate across all conditions (even at p = 60 with nonnormal data). In contrast, CIs and tests of close fit based on the RMSEA are only accurate in small models. In larger models (p ≥ 30), they incorrectly suggest that models do not fit closely, particularly if sample size is less than 500. 相似文献
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Primary science education is a concern around the world and quality mentoring within schools can develop pre‐service teachers' practices. A five‐factor model for mentoring has been identified, namely, personal attributes, system requirements, pedagogical knowledge, modelling, and feedback. Final‐year pre‐service teachers (mentees, n = 211) from three Turkish universities were administered a previously validated instrument to gather perceptions of their mentoring in primary science teaching. ANOVA indicated that each of these five factors was statistically significant (p<.001) with mean scale scores ranging from 3.36 to 4.12. Although mentees perceived their mentors to provide evaluation feedback (95%), model classroom management (88%), guide their preparation (96%), and outline the science curriculum (92%), the majority of mentors were perceived not to assist their mentees in 10 of the 34 survey items. Professional development programmes that target the specific needs of these mentors may further enhance mentoring practices for advancing primary science teaching. 相似文献
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Human service students were surveyed (N = 207) to determine their perceptions about homeless elders and communal responsibility for their well-being. Using a backward regression analysis, a final model (F = 15.617, df = 7, p < .001) for Perceptions about Homeless Persons and Community Responsibility (predicted variable) included the predictor variables of Homeless Older Persons Are Afraid and Lonely; Homeless Persons and Health Issues; History of Homeless Older People's Life on the Street; Touching a Homeless Older Person; Hygiene and Homeless Older People; Interest in Working with Elders; and Educational status. The findings indicated that the predictor variables accounted for more than 36% of the variance in Perceptions about Homeless Older Persons and Community Responsibility (R 2 = .386; adjusted R 2 = .361). 相似文献
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Older people who are living with dementia often need healthcare, including hospital admissions, due to additional health conditions. Caring for older people who are living with dementia is, therefore, a core nursing role. This study investigated student nurses’ expectations of, and confidence about, caring for older people with dementia and the effect of students’ age, precourse experience, and their academic year. The design was a cross-sectional survey using questionnaires to collect data. The participants (n = 328), based at one university in England, had all had at least one practice learning placement. Most student nurses (n = 202; 62%) had precourse contact with older people with dementia and had cared for them during the course (n = 291; 89%). The student's academic year significantly affected confidence about caring for older people with dementia (p = .006), but still only 52% (n = 26) of third-year students felt “generally confident.” Precourse contact with older people with dementia had a significant impact on expectations (p = .001) and confidence in caring for people with dementia (p = .002). Students who were >25 years were significantly more likely to have had precourse contact with older people with dementia (p = < .001). Nurse educators should ensure that students entering nurse education appreciate that caring for older people who are living with dementia will be a core part of their role. They must proactively prepare nursing students to care for people with dementia, recognizing that some students have no previous contact, which may affect their confidence and experiences. 相似文献
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In research on the nature of science, there is a need to investigate the role and status of different scientific knowledge forms. Theories and models are two of the most important knowledge forms within biology and are the focus of this study. During interviews, preservice biology teachers (N = 10) were asked about their understanding of theories and models. They were requested to give reasons why they see theories and models as either tentative or certain constructs. Their conceptions were then compared to philosophers’ positions (e.g., Popper, Giere). A category system was developed from the qualitative content analysis of the interviews. These categories include 16 conceptions for theories (n tentative = 11; n certain = 5) and 18 conceptions for models (n tentative = 10; n certain = 8). The analysis of the interviews showed that the preservice teachers gave reasons for the tentativeness or certainty of theories and models either due to their understanding of the terms or due to their understanding of the generation or evaluation of theories and models. Therefore, a variety of different terminology, from different sources, should be used in learning-teaching situations. Additionally, an understanding of which processes lead to the generation, evaluation, and refinement or rejection of theories and models should be discussed with preservice teachers. Within philosophy of science, there has been a shift from theories to models. This should be transferred to educational contexts by firstly highlighting the role of models and also their connections to theories. 相似文献