@JamesPsychol Try plotting the sample sizes vs. effect size. Very clear publication bias.
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@charlesmurray@JayMan471 details and links here http://drjamesthompson.blogspot.co.uk/2015/06/is-it-worth-giving-children-pre-school.html …1 retweet 6 favorites
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James Thompson
Emil OW Kirkegaard
Charles Murray
Carleton
