#effectsizeCalculator

[bsrtips]

Conduct a Simple Meta Analysis Easily with SPSS Macro

To save time in conducting a simple meta analysis, use the Wilson Macro. Here are the steps:

1. Download the macro by downloading the zip file for the Wilson macro found at this website: http://mason.gmu.edu/~dwilsonb/ma.html

2. Create an spss data set that includes a line for each study you want to include in the analysis. For each study, you should have a column for the study id number, d cohen’s value (effect size, ES), the variance (v), and the inverse weighting value. You can easily find the ES value and v if you have your t/f statistic and sample size by using this website: https://www.campbellcollaboration.org/escalc/html/EffectSizeCalculator-SMD-main.php. To calculate the inverse weighting, simply calculate 1/v 

3. Run the Macro using Syntax in SPSS. You can find the syntax for the command in the readme file in the zip for the macro. Or you can watch this video for clear instructions on running the meta analysis: https://www.youtube.com/watch?v=hVvXvcDXDt4. As you will see, you can choose the type of meta analysis you would like to run including underlying assumptions about the distribution/heterogeneity and inclusion of moderators, etc.