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What is meta-analysis?
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What are some of the common problems with the use of meta-analysis?
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Why do you focus on averages and therefore ignore the complexity of the classroom and the wide variety of results?
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Why is the research focused on one dimension of schooling i.e., student achievement?
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How do you allow for variability in design and quality for the studies gathered in the Visible Learning book? How can we be sure the results are robust?
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Many of the high effects in the 2009 book e.g., student feedback, linking prior and subsequent learning, going from known to unknown are from the early 1970’s. Are we running the risk of just putting numbers to old ideas?
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Most of the studies in the book (2009) were carried out in a highly developed English-speaking countries. Is the research therefore applicable to non-English speaking, non-Western countries?
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On which studies is the “pie” from the Visible Learning based?
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The table of 'effect sizes' in the book clearly identifies the effects of one element and the effect size of another on student achievement, but what consideration is given to the inter-correlation between those areas?
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What have you seen that works in education?