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A basic introduction to fixedeffect and randomeffects ...

research ArticleReceived 1 December 2009,Revised 19 August 2010,Accepted 25 August 2010 Published online in Wiley Online Library( ) DOI: basic introduction to fixed-effect andrandom-effects models for meta-analysisMichael Borensteina , Larry V. Hedgesb, Julian Higginscand Hannah R. RothsteindThere are two popular statistical models for meta-analysis, the fixed-effect model and the random-effects model. Thefact that these two models employ similar sets of formulas to compute statistics, and sometimes yield similar estimatesfor the various parameters, may lead people to believe that the models are interchangeable.

Research Article Received 1 December 2009, Revised 19 August 2010, Accepted 25 August 2010 Published online in Wiley Online Library (wileyonlinelibrary.com) DOI: 10.1002/jrsm.12 A basic introduction to fixed-effect and random-effects models for meta-analysis MichaelBorensteina∗†,LarryV.Hedgesb,JulianP.T.Higginsc andHannahR.Rothsteind

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