Res Synth Methods - Meta-regression approximations to reduce publication selection bias.

Tópicos

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Resumo

Publication selection bias is a serious challenge to the integrity of all empirical sciences. We derive meta-regression approximations to reduce this bias. Our approach employs Taylor polynomial approximations to the conditional mean of a truncated distribution. A quadratic approximation without a linear term, precision-effect estimate with standard error (PEESE), is shown to have the smallest bias and mean squared error in most cases and to outperform conventional meta-analysis estimators, often by a great deal. Monte Carlo simulations also demonstrate how a new hybrid estimator that conditionally combines PEESE and the Egger regression intercept can provide a practical solution to publication selection bias. PEESE is easily expanded to accommodate systematic heterogeneity along with complex and differential publication selection bias that is related to moderator variables. By providing an intuitive reason for these approximations, we can also explain why the Egger regression works so well and when it does not. These meta-regression methods are applied to several policy-relevant areas of research including antidepressant effectiveness, the value of a statistical life, the minimum wage, and nicotine replacement therapy.

Resumo Limpo

public select bias serious challeng integr empir scienc deriv metaregress approxim reduc bias approach employ taylor polynomi approxim condit mean truncat distribut quadrat approxim without linear term precisioneffect estim standard error pees shown smallest bias mean squar error case outperform convent metaanalysi estim often great deal mont carlo simul also demonstr new hybrid estim condit combin pees egger regress intercept can provid practic solut public select bias pees easili expand accommod systemat heterogen along complex differenti public select bias relat moder variabl provid intuit reason approxim can also explain egger regress work well metaregress method appli sever policyrelev area research includ antidepress effect valu statist life minimum wage nicotin replac therapi

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