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wawa3009新蟲 (初入文壇)
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[求助]
求<introduction to Meta-analysis>中2句話怎么理解
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求<introduction to Meta-analysis>中以下斜體字的2句話怎么理解 1關(guān)于標(biāo)準(zhǔn)均數(shù)差的 The standardized mean difference can be considered as being comparable across studies based on either of two arguments (Hedges and Olkin, 1985). If the outcome measures in all studies are linear transformations of each other, the standardized mean difference can be seen as the mean difference that would have been obtained if all data were transformed to a scalewhere the standard deviation within-groups was equal to 1.0. 2關(guān)于風(fēng)險比 比數(shù)比 風(fēng)險差這幾個效應(yīng)量的使用 The risk ratio and odds ratio are relative measures, and therefore tend to be relatively insensitive to differences in baseline events. By contrast, the risk difference is an absolute measure and as such is very sensitive to the baseline risk. If we wanted to test a compound and believed that it reduced the risk of an event by 20%regardless of the baseline risk, then by using a ratio index we would expect to see the same effect size across studies even if the baseline risk varied from study to study. The risk difference, by contrast, would be higher in studies with a higher base rate    |
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