Why might it not make much sense to examine the results for heterogeneity of effects? Bisson and Andrew (2007) conducted a meta-analysis of cognitive behavior therapy (CBT) as a treatment for posttraumatic stress disorder (PTSD). They found 14 studies for which they had clinician’s ratings of PTSD symptoms in both a CBT-focused condition and a wait list usual care condition. The results follow:
Answer to relevant QuestionsHow might you redesign our study of morphine tolerance to involve three groups of mice to provide more information on the question at hand? Most people assume that random numbers are actually more orderly than they really are. For example, they assume that if you draw 50 random numbers, Nature will somehow almost ensure that you have 25 even numbers and 25 odd ...I have been (correctly) criticized for using “the number of hairs on a goat” as an example of a continuous variable in an earlier edition of this book. Why is this really a discrete variable? Would this alter how you ...Apply a meta-analysis to these data and draw the appropriate conclusions. Three of the studies referred to in the previous exercises also looked at ratings of ADHD severity. These results follow: (a) Compute the mean effect size from these studies. (b) Compute confidence limits on the mean effect ...
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