![]() Studies: a variable containing an identification of the different studies. ![]() The dialog box for "Meta-analysis: correlation" can then be completed as follows: The data of different studies can be entered as follows in the spreadsheet: Next the heterogeneity statistic is incorporated to calculate the summary Correlation coefficient under the random effects model (DerSimonian and Laird, 1986). ![]() MedCalc uses the Hedges-Olkin (1985) method for calculating the weighted summary Correlation coefficient under the fixed effects model, using a Fisher Z transformation of the correlation coefficients. ![]() For a short overview of meta-analysis in MedCalc, see Meta-analysis: introduction. ![]()
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