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      Effects of Integrated Literacy and Content-area Instruction on Vocabulary and Comprehension in the Elementary Years: A Meta-analysis

      1 , 2 , 3
      Scientific Studies of Reading
      Informa UK Limited

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          Bias in meta-analysis detected by a simple, graphical test

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            Introduction to Meta-Analysis

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              Robust variance estimation in meta-regression with dependent effect size estimates.

              Conventional meta-analytic techniques rely on the assumption that effect size estimates from different studies are independent and have sampling distributions with known conditional variances. The independence assumption is violated when studies produce several estimates based on the same individuals or there are clusters of studies that are not independent (such as those carried out by the same investigator or laboratory). This paper provides an estimator of the covariance matrix of meta-regression coefficients that are applicable when there are clusters of internally correlated estimates. It makes no assumptions about the specific form of the sampling distributions of the effect sizes, nor does it require knowledge of the covariance structure of the dependent estimates. Moreover, this paper demonstrates that the meta-regression coefficients are consistent and asymptotically normally distributed and that the robust variance estimator is valid even when the covariates are random. The theory is asymptotic in the number of studies, but simulations suggest that the theory may yield accurate results with as few as 20-40 studies. Copyright © 2010 John Wiley & Sons, Ltd.
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                Author and article information

                Contributors
                (View ORCID Profile)
                (View ORCID Profile)
                Journal
                Scientific Studies of Reading
                Scientific Studies of Reading
                Informa UK Limited
                1088-8438
                1532-799X
                May 04 2022
                August 30 2021
                May 04 2022
                : 26
                : 3
                : 223-249
                Affiliations
                [1 ]Department of Educational Psychology, College of Education and Human Development, University of Minnesota, Minneapolis, MN, USA
                [2 ]School of Teacher Education and Florida Center for Reading Research, Florida State University, Tallahassee, FL, USA
                [3 ]Florida State University, Tallahassee, FL, USA
                Article
                10.1080/10888438.2021.1954005
                f7ffdaa9-163e-44fb-8741-11932355f31e
                © 2022
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