Transcription of Fixed-Effect Versus Random-Effects Models
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Fixed-Effect Versus Random-Effects Models
CHAPTER 13 Fixed-Effect Versus Random-EffectsModelsIntroductionDefiniti on of a summary effectEstimating the summary effectExtreme effect size in a large study or a small studyConfidence intervalThe null hypothesisWhich model should we use?Model shouldnotbe based on the test for heterogeneityConcluding remarksINTRODUCTIONIn Chapter 11 and Chapter 12 we introduced the Fixed-Effect and Random-Effects Models . Here, we highlight the conceptual and practical differencesbetween the forest plots in Figures and They include the same sixstudies, but the first uses a Fixed-Effect analysis and the second a random-effectsanalysis. These plots provide a context for the discussion that OF A SUMMARY EFFECTBoth plots show a summary effect on the bottom line, but the meaning of thissummary effect is different in the two Models .
Fixed-Effect Versus Random-Effects Models Introduction Definition of a summary effect Estimating the summary effect ... dose, measure, and so on (we assume that there is no concern about practice effects for the researchers, nor for the different starting times of the various cohorts). All the studies are expected to share a common
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