How to Calculate Meta-Analysis

Meta-analysis is a statistical method used to combine the results of multiple scientific studies. It’s crucial for drawing robust conclusions from research data. This calculator helps you perform meta-analyses with ease.

How to Use This Calculator

Enter the number of studies.
Input the effect sizes of each study, separated by commas.
Input the variances of each study, separated by commas.
Click ‘Calculate’.

Formula & Methodology

The calculator uses the inverse variance method to weight studies based on their precision. The formula for the pooled effect size is:

E_pooled = (∑(E_i/V_i)) / (∑(1/V_i))

Real-World Examples

Data & Statistics

Example Studies
Study	Effect Size	Variance
1	0.5	0.25
2	0.3	0.16

Calculation Results
Pooled Effect Size	Standard Error	95% Confidence Interval

Expert Tips

Always ensure the studies you’re combining are similar enough to be comparable.
Be aware of potential biases, such as publication bias.
Consider using a random-effects model if studies are heterogeneous.

Interactive FAQ

What is the difference between a fixed-effects and random-effects model?

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For more information, see this guide from the National Institutes of Health and this resource from the CDC.

How To Calculate Meta-Analysis