An evaluation of the impact of continuous moderator variables on effect size.The programs for analysing the influence of moderator variables use weighted multiple regression to supply: (Windows XP and Mac users note that you need to edit the file as described in getting started)Ī moderator variable is a predictor variable, with a known value forĮach study, that has been proposed (preferably on theoretical grounds)Īs a candidate to explain heterogeneity among effect sizes. Select the syntax file Meta_Basic_D_h.sps and, when it has opened, click Run | All on its top menu bar.Start up SPSS and open the dataset Pozzulo_&_Lindsay_1998.sav.(Windows XP and Mac users note that you need to edit the file as described in getting started)Įxample 4: Difference Between Two Proportions Select the syntax file Meta_Basic_d.sps and, when it has opened, click Run | All on its top menu bar.Start up SPSS and open the dataset Else-Quest_et_al_2006.sav.We inciude it here as an additional file that might be useful.Įxample 3: Standardised Difference Between Two Means This syntax file does not form part of the Field & Gillett (2010) paper and was adapted from our syntax by Maja Osolnik(Saint Cloud State University). It adds the corrected correlations (corrected for measurement error), observed variance of the corrected correlation, the standard deviation of the corrected correlations, 80% credibility interval around the corrected correlations, and variance attributable to study artifacts). However, unlike the Meta_Basic_r.sps file it includes a more complete version of the H-S method. This file differs from the one above in that it conducts only the Hunter-Schmidt Method.(Windows XP and Mac users note that you need to edit the file as described in getting started)Įxample 2: Correlation (Hunter Schmidt Only) Select the syntax file Meta_Basic_r.sps and, when it has opened, click Run | All on its top menu bar.On the top menu bar, click File | Open | Syntax and go to the Meta-Analysis folder. Start up SPSS and open the dataset Cartwright-Hatton_et_al_2004.sav.Output for both fixed-effects and random-effects models.Elementary indicators of, and tests for, the presence of publication bias.A test of homogeneity of effect size that contributes to the assessment of the goodness of fit of the statistical model.An estimate of the average effect size of all studies, or any subset of studies.cd "Documents\Meta-Analysis").Įach program for basic meta-analysis provides: MacOS: change the syntax to delete the stuff before 'Documents' (i.e.cd "%HOMEDRIVE%%HOMEPATH%\My Documents\Meta-Analysis").
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