Invited commentary: a critical look at some popular meta-analytic methods.
Meta-analysis is essential for obtaining reproducible summaries of study results and valuable for discovering patterns among study results. A good meta-analysis will highlight and delineate the subjective components of these processes and vigorously search for sources of heterogeneity. Unfortunately, these objective are not always met by common techniques. For example, a scatterplot is an objective summarization if the data are uncensored, but inferred patterns should be regarded as subjective recognitions of the analyst, not objective data properties. Random-effects summaries encourage averaging over important data patterns, divert attention from key sources of heterogeneity, and can amplify distortions produced by publication bias; such summaries should only be used when important heterogeneity remains after a thorough search for the sources of such heterogeneity. Quality scoring adds the analyst's subjective bias to the results, wastes information, and can prevent the recognition of key sources of heterogeneity; it should be completely replaced by meta-regression on quality items (the score components).
Department of Epidemiology, University of California, Los Angeles School of Public Health.
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Greenland
D015982:Bias; D003627:Data Interpretation, Statistical; D004812:Epidemiologic Methods; D006801:Humans; D015201:Meta-Analysis as Topic; D015233:Models, Statistical; D011786:Quality Control; D012044:Regression Analysis