http://www.aberdeen-education.org.uk/files/Research/3%20What%20has%20the%20greatest%20i... - 0 views
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Jenny Darrow on 29 Jul 13He says 'effect sizes' are much the best way of answering the question 'what has the greatest influence on student learning'. An effect-size of 1.0 is typically associated with: * advancing learner's achievement by one year, or improving the rate of learning by 50%, * a correlation between some variable (e.g., amount of homework) and achievement of approximately .50. * average students receiving that treatment exceeding 84% of students not receiving that treatment. * A two grade leap in GCSE, e.g. from a C to an A grade. An effect size of 1.0 is clearly enormous! (It is defined as an increase of one standard deviation)