statisticalvspracticalsignificance(完整版)
【正文】 ounted for measures Difference effect sizes ? Simple mean difference ? Suppose you design at control group experiment to evaluate the effects of CBT on depression. – Experimental group post test score = 18 – Control group post test score = 16 – Difference = 18 – 16 = 2 Difference effect sizes ? Problem with simple mean difference – Dependent on the scale of measurement – Ignores normal variation in scores – For example, if the following example was based on a scale with a SD of 15 points, a 2 point difference would be small – treatment would only effect depression by .13 SDs. – If the example was based on a scale with a SD of 1 point, a 2 point difference would be very large – treatment had a 2 SD effect Difference effect sizes ? We can overe this problem by standardizing the mean differences ? One measure of this was done by Gene Glass D = (
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