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1.
This article describes the effects of an analysis-of-practice professional development (PD) program on elementary school students' (Grades 4–6) science outcomes. The study design was a cluster-randomized trial with an analysis sample of 77 schools, 144 teachers and 2,823 students. Forty-two schools were randomly assigned to treatment, (88.5 hours) of integrated analysis-of-practice and content deepening PD (over the course of one year) while 35 schools were randomly assigned to receive an equal number of PD hours in science content deepening alone. Students' content knowledge, as measured by a project-specific test, was compared across treatment groups. The effect size for this comparison was 0.52 standard deviations in favor of students whose teachers participated in the PD that included analysis-of-practice. This effect compares favorably to that of other elementary school interventions whose effectiveness was studied with a narrowly focused outcome measure. Analysis of the demographics of the study schools suggests that the treatment effect could be relevant outside the local study context. Implications for future research include tests of mediation for teacher-level outcomes and efficacy tests of specific teaching strategies (intervention subcomponents).  相似文献   

2.
When modeling latent variables at multiple levels, it is important to consider the meaning of the latent variables at the different levels. If a higher-level common factor represents the aggregated version of a lower-level factor, the associated factor loadings will be equal across levels. However, many researchers do not consider cross-level invariance constraints in their research. Not applying these constraints when in fact they are appropriate leads to overparameterized models, and associated convergence and estimation problems. This simulation study used a two-level mediation model on common factors to show that when factor loadings are equal in the population, not applying cross-level invariance constraints leads to more estimation problems and smaller true positive rates. Some directions for future research on cross-level invariance in MLSEM are discussed.  相似文献   

3.
This meta-analysis examined the effectiveness of improving reading comprehension for students in K-12 classrooms using intelligent tutoring systems (ITSs), a computer-based learning environment that provides customizable and immediate feedback to the learner. Nineteen studies from 13 publications incorporating approximately 10 000 students were included in the final analysis; using robust variance estimation to account for statistical dependencies, the 19 studies yielded 88 effect size estimates. The meta-analysis indicated that the overall random effect size of ITSs on reading comprehension was 0.60 (using a mix of standardized and researcher-designed measures) with a 95% confidence interval 0.36 to 0.85 (p < 0.001). This review confirms previous studies comparing ITSs to human tutoring: ITSs produced a small effect size when compared to human tutoring (0.20, 0.02–0.38, p = 0.036, n = 21). All comparisons to human tutoring used standardized measures. This review also found that ITSs produced a larger effect size on reading comprehension when compared to traditional instruction (0.86) for mixed measures and (0.26) for standardized measures. These findings may be of interest to practitioners and policy makers seeking to improve reading comprehension using consistent and accessible ITSs. Recommendations for researchers include conducting studies to understand the difference between traditional and updated versions of ITSs and employing valid and reliable standardized tests and researcher-designed measures.  相似文献   

4.
Abstract

When well-implemented, mediation analyses play a critical role in probing theories of action because their results help lay the ground work for the critical development of a treatment and the iterative advancement of theories that are foundational to a discipline. Despite strong interest in designs that incorporate mediation, few studies have developed effective and efficient strategies to plan experiments examining multilevel mediation. We probe several design strategies for cluster-randomized designs and derive sampling plans that maximize power under cost constraints. The results suggest that among the more durable design strategies for mediation is covariance adjustment on variables predictive of the outcome and optimal sample allocation. The statistical power and optimal sample allocation results are implemented in the R package PowerUpR.  相似文献   

5.
This article explores the effectiveness of a computer-based spatial learning strategy approach for improving reading comprehension and writing. In reading comprehension, students received scaffolded practice in translating passages into graphic organizers. In writing, students received scaffolded practice in planning to write by filling in graphic organizers and in translating them into passages. Based on a cluster-randomized sampling process, 2,468 students distributed in 12 schools and 69 classrooms participated in the study. Schools were randomly assigned to the computer-based instruction (CBI) group or traditional instruction (TI) group. Teachers assigned to the CBI treatment integrated the applications into the language arts curriculum during one school semester. A standardized test was used to measure reading comprehension and writing. The data were analyzed through a statistical multilevel model. The findings showed that students in the CBI group improved their reading and writing skills significantly more than students under TI—yielding an effect size d = 0.30.  相似文献   

6.
随着中国经济的快速发展及经济结构的调整,劳动关系的含义更加多样化和复杂化,劳动争议案件数量日益增多。那么,如何最大限度利用调解程序化解劳资矛盾,定纷止争,是当前我们迫切需要思考与解决的问题。我国劳动争议调解程序目前存在的问题主要是仲裁前调解程序作用有限、调解程序不规范、裁诉调解程序不能有效衔接等。为解决上述问题,我国劳动争议调解程序应成立政府主导的劳动争议调解机构,构建协调联动调解机制,规范调解为必经程序,引导调裁诉对接,增强调解程序的实效性,从而使得劳动争议调解程序发挥应有的作用。  相似文献   

7.
Abstract

In this study, we compared the effects of two experimental multiple-strategy approaches (content-area comprehension and vocabulary) to typical fourth-grade social studies instructional practices. An 18-week, cluster-randomized study was conducted to estimate effects measured by normative-referenced reading comprehension and vocabulary measures and researcher- and district-developed measures of social studies vocabulary and content. Forty-eight teachers and their respective 903 students from 15 schools were randomly assigned by school to one of three conditions: content vocabulary, content reading comprehension, or typical practice. Experimental teachers participated in 6 professional development sessions over 21 weeks. Structural equation modeling results indicated reliable differences favoring both experimental conditions over typical practice on the social studies content measure and substantively important effects on content and standardized vocabulary measures. Students in the vocabulary intervention also outperformed typical practice peers on the curriculum-based vocabulary assessment. Effects of the comprehension and vocabulary conditions were comparable except for the significant effect of vocabulary on the curriculum-based vocabulary measure. Effect sizes for teaching quality on the standardized comprehension measure ranged from d = .26 to .32; however, these effects were not statistically significant.  相似文献   

8.
The misinterpretation and overuse of significance testing in the social sciences has been widely criticized. This criticism is reviewed, along with several recommendations found in the literature, including the use of effect size measures to enhance the interpretation of significance testing. A review of typical effect size measures and their application is followed by an analysis of the extent to which effect size measures have been applied in three prominent journals on learning disabilities over a 10-year period. Specific recommendations are offered for using effect size measures to improve the quality of reporting on quantitative research in the field of learning disabilities.  相似文献   

9.
为考察社交网络使用对大学生孤独感的影响及其内在机制,采用社交网络使用强度问卷、线上积极反馈问卷、社交焦虑量表和孤独感量表,对964名大学生进行调查。结果发现:(1)社交网络使用、线上积极反馈、社交焦虑和孤独感两两之间显著相关;(2)社交网络使用能通过线上积极反馈和社交焦虑的中介作用对孤独感产生影响,且该中介作用包含了三条路径:线上积极反馈的单独中介作用、社交焦虑的单独中介作用以及线上积极反馈和社交焦虑的链式中介作用。线上积极反馈和社交焦虑在社交网络使用预测大学生孤独感中起多重中介作用。本研究揭示了社交网络使用与孤独感的关系及其内在机制,深化了社交网络使用对个体心理健康影响的研究。  相似文献   

10.
This study investigated whether mothers are responsive to their children's literacy level, thus employing different writing mediation styles with each twin according to the child's level, or whether they possess a consistent style employed with both twins. The sample included 28 sets of twin kindergartners (56 children, M age = 68.89 months) and their mothers. Children's literacy underwent individual assessment in their kindergartens. During home visits, mother-child writing interactions with each twin were videotaped. Interactions underwent analysis for task-specific measures (grapho-phonemic mediation, printing mediation, demand for precision, reference to orthography) and for general measures (atmosphere, mutuality, reinforcements, task perception). Findings demonstrated that along with sensitivity to the child's level (mediating on a higher level to the higher achieving twin), mothers of twins possessed a consistent mediation style. Sensitivity to the differences in literacy between the twins was salient in the task-specific mediation measures, whereas the presence of a style appeared in all the mediation measures. The results of this study support the stance that mothers' mediation style deserves to be acknowledged as an influencing factor in children's literacy development.  相似文献   

11.
This study investigated whether mothers are responsive to their children's literacy level, thus employing different writing mediation styles with each twin according to the child's level, or whether they possess a consistent style employed with both twins. The sample included 28 sets of twin kindergartners (56 children, M age = 68.89 months) and their mothers. Children's literacy underwent individual assessment in their kindergartens. During home visits, mother–child writing interactions with each twin were videotaped. Interactions underwent analysis for task-specific measures (grapho-phonemic mediation, printing mediation, demand for precision, reference to orthography) and for general measures (atmosphere, mutuality, reinforcements, task perception). Findings demonstrated that along with sensitivity to the child's level (mediating on a higher level to the higher achieving twin), mothers of twins possessed a consistent mediation style. Sensitivity to the differences in literacy between the twins was salient in the task-specific mediation measures, whereas the presence of a style appeared in all the mediation measures. The results of this study support the stance that mothers' mediation style deserves to be acknowledged as an influencing factor in children's literacy development.  相似文献   

12.
Analysis of variance is one of the most frequently used statistical analyses in the behavioral, educational, and social sciences, and special attention has been paid to the selection and use of an appropriate effect size measure of association in analysis of variance. This article presents the sample size procedures for precise interval estimation of eta-squared and partial eta-squared in fixed-effects analysis of variance designs. The desired precision of a confidence interval is assessed with respect to (a) the control of expected width and (b) the tolerance probability of interval width within a designated value. In addition, sample size calculations for standardized contrasts of treatment effects and corresponding partial strength of association effect sizes are also considered.  相似文献   

13.
In this study, we examine the relationship between contextual variables related to teachers and student performance in Advanced Algebra classrooms in the USA. The data were gathered from a cluster-randomized study on the effects of SimCalc MathWorlds®, a curricular and technological intervention as a replacement for Algebra 2 curriculum, on student learning of Algebra 2 content. Conditional measures (teacher background characteristics) and instructional measures (self-reported instructional preferences, stances, and classroom practices) were subjected to a variety of empirical analyses to discern their relationship to student learning. Researchers examined both the overall effect of teacher contextual variables on student learning and the specific effect of SimCalc on both teacher instructional measures and student performance. There is evidence to support that teachers who use the SimCalc curriculum value classroom communication, deep understanding of math concepts, and support for both routine and non-routine problems.  相似文献   

14.
This study investigates how school-level standardized testing policy at Grade 1 is directly and indirectly linked to math achievement in primary grades. Using nationally representative Early Childhood Longitudinal Study-Kindergarten Cohort data drawn from the U.S., the sample consists of 6774 children nested in 925 elementary schools. Findings from a multilevel full structural mediation analysis indicate that despite children’s short-term gains at Grade 1, the positive effects of frequent testing policy at Grade 1 do not persist in Grade 3. In contrast, school-level standardized testing policies were negatively associated with math achievement at Grade 3 mediated by procedural instructional approaches (e.g., drills). The findings provide empirical evidence on the validity of standardized testing in primary-grade mathematics and offer implications for teachers, educational policymakers, and researchers.  相似文献   

15.
Drawing from data use theory (i.e., a theory for making data-driven educational decisions), the present study sought to understand how frequency of standardized testing is related to student learning, mediated by reading instruction, after controlling for child-level (e.g., gender, race/ethnicity) and school-level covariates (e.g., private/public, proportion of students eligible for free lunch). Using data from the Early Childhood Longitudinal Study Kindergarten Cohort of 2010–2011, the sample included 12,241 children attending 1067 kindergartens in the U.S. findings from a multilevel structural equation mediation model suggest that the frequency of state/local standardized testing in kindergarten did not have a direct effect on reading achievement near the end of kindergarten, after controlling for covariates. However, the amount and type of reading instruction mediated the relationship between the frequency of testing and reading achievement, after controlling for covariates. The implications for policy and practice on the use of standardized tests in kindergarten are discussed.  相似文献   

16.
Researchers are often interested in whether the effects of an intervention differ conditional on individual- or group-moderator variables such as children's characteristics (e.g., gender), teacher's background (e.g., years of teaching), and school's characteristics (e.g., urbanity); that is, the researchers seek to examine for whom and under what circumstances an intervention works. Furthermore, the researchers are interested in understanding and interpreting variability in treatment effects through moderation analysis as an approach to exploring the sources of the treatment effect variability. This study develops formulas for power analyses to detect the moderator effects in designing three-level cluster randomized trials (CRTs). We develop the statistical formulas for calculating statistical power, minimum detectable effect size difference, and 95% confidence intervals for cluster or cross-level moderation, nonrandomly varying or random slopes, binary or continuous moderators, and designs with or without covariates. We demonstrate how the calculations can be used in the planning phase of three-level CRTs using the software PowerUp!-Moderator.  相似文献   

17.
我国行政诉讼不适用调解制度,这对行政纠纷的解决有诸多消极影响,本文在探讨行政调解常制度合理性的基础之上,对我国行政调解制度的建立提出一些初步的设想,即本着自愿、合法、便民、高效的原则,明确可进行行政调解的范围、规范法官对调解的介入及赋予调解书执行力,设置相应的补救措施。  相似文献   

18.
Latent growth curve mediation models are increasingly used to assess mechanisms of behavior change. For latent growth mediation model, like any another mediation model, even with random treatment assignment, a critical but untestable assumption for valid and unbiased estimates of the indirect effects is that there should be no omitted variable that confounds indirect effects. One way to address this untestable assumption is to conduct sensitivity analysis to assess whether the inference about an indirect effect would change under varying degrees of confounding bias. We developed a sensitivity analysis technique for a latent growth curve mediation model. We compute the biasing effect of confounding on point and confidence interval estimates of the indirect effects in a structural equation modeling framework. We illustrate sensitivity plots to visualize the effects of confounding on each indirect effect and present an empirical example to illustrate the application of the sensitivity analysis.  相似文献   

19.
Increasing the correlation between the independent variable and the mediator (a coefficient) increases the effect size (ab) for mediation analysis; however, increasing a by definition increases collinearity in mediation models. As a result, the standard error of product tests increase. The variance inflation caused by increases in a at some point outweighs the increase of the effect size (ab) and results in a loss of statistical power. This phenomenon also occurs with nonparametric bootstrapping approaches because the variance of the bootstrap distribution of ab approximates the variance expected from normal theory. Both variances increase dramatically when a exceeds the b coefficient, thus explaining the power decline with increases in a. Implications for statistical analysis and applied researchers are discussed.  相似文献   

20.
The present study examined the link between teacher–student relationship at the class level and academic achievement via the serial multiple mediation effect of self-efficacy and learning strategy in Chinese EFL context with 11,036 eighth graders. Student-reported measures of teacher–student relationship, English self-efficacy, learning strategy and curriculum-based measures of English achievement were collected in fall 2015. Multilevel mediation model revealed that the positive relationship between teacher–student relationship at the class level and English achievement was partially mediated by self-efficacy, cognitive and metacognitive strategy, and serially mediated by self-efficacy and then learning strategy in Chinese EFL context, controlling for SES and gender. The findings suggest that positive teacher–student relationship can help students to develop English proficiency by fostering their English self-efficacy and use of learning strategy. The results of the present study extend our understanding of influential factors in foreign language learning processes and hold substantive theoretical and practical implications for educational researchers as well as teachers.  相似文献   

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