March 2024
Intermediate to advanced
610 pages
24h 12m
English
Content preview from Introduction to the New Statistics, 2nd Edition
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9 Meta-Analysis
This is the good news chapter. In previous chapters I’ve said that, unfortunately, sampling variability is often large and CIs long. Jacob Cohen, the great statistical reformer, said “I suspect that the main reason they [CIs] are not reported is that they are so embarrassingly large!” (Cohen, 1994, p. 1002).
The good news is meta-analysis, which can produce strong evidence where at first sight there’s only weak evidence. It can turn long CIs into short ones (well, sort of), find answers in what looks like a mess, and settle heated controversies. Much of what it does can be displayed in a beautiful picture, the forest plot, which I’ll use to explain meta-analysis and why I think it’s so great. ...
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