| Problems
of meta-analysis |
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| • | Studies
are often not similar in design, population |
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| characteristics,
etc. |
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| • | If
they are not similar in design, then they should |
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| not
be meta-analyzed. |
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| • | If
they are similar in design, they may have biases |
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| in
common. |
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| • | Pooling
the results of many small biased studies |
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| gives
you a biased result that is statistically |
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| significant. |
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| • | Impressive
but bad science. |
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