Wim Van den Noortgate Katholieke Universiteit Leuven, Belgium

Belgian Campbell GroupWim.VandenNoortgate@kuleuven-kortrijk.be

Workshop systematic reviews Leuven June 4-6, 2012

Demonstration software

1. Comprehensive meta-analysis (CMA)

• http://www.meta-analysis.com/A. Running a fixed or random effects meta-

analysisB. Exploring the moderating effect of ‘Weeks’ as

a categorical variableC. Exploring the moderating effect of ‘Weeks’ as

a continuous variableD. Adding data in other formats

1. Comprehensive meta-analysis (CMA)

• http://www.meta-analysis.com/A. Running a fixed or random effects meta-

analysisB. Exploring the moderating effect of ‘Weeks’ as

a categorical variableC. Exploring the moderating effect of ‘Weeks’ as

a continuous variableD. Adding data in other formats

Copy data from Excel to CMA (without variable names)

Double click on ‘B’, give this variable a name and define it as the study identificator

In the same way, define ‘Weeks’ as a categorical

moderator

Defining the g’s as effect sizes

Influential studies?

‘Convergence’ over time? (here not useful)

Publication bias?

1. Comprehensive meta-analysis (CMA)

• http://www.meta-analysis.com/A. Running a fixed or random effects meta-

analysisB. Exploring the moderating effect of ‘Weeks’

as a categorical variableC. Exploring the moderating effect of ‘Weeks’ as

a continuous variableD. Adding data in other formats

1. Comprehensive meta-analysis (CMA)

• http://www.meta-analysis.com/A. Running a fixed or random effects meta-

analysisB. Exploring the moderating effect of ‘Weeks’ as

a categorical variableC. Exploring the moderating effect of ‘Weeks’

as a continuous variableD. Adding data in other formats

1. Comprehensive meta-analysis (CMA)

• http://www.meta-analysis.com/A. Running a fixed or random effects meta-

analysisB. Exploring the moderating effect of ‘Weeks’ as

a categorical variableC. Exploring the moderating effect of ‘Weeks’ as

a continuous variableD. Adding data in other formats

2. R• http://cran.r-project.org/ (R & manuals) • http://www.metafor-project.org/ (metafor &manuals)• Some preliminary notes:

o Type in (or paste) commandso Push ‘Enter’ to runo Use arrow keys to go back to previous commando ##: to include notes that should be ignoredo <-: means ‘equal to’o Control R: to run a selection from a script

• “Save workspace”: saving command history, objects, data, …