How Calculate Proportional Eta Squared In Rstudio

Introduction & Importance

Proportional eta squared (η²) is a measure of effect size in analysis of variance (ANOVA). It indicates the proportion of variance in the dependent variable that is attributable to the independent variable…

How to Use This Calculator

1. Enter the number of groups (n) and number of treatments (k).
2. Enter the sum of squares between (SSB) and sum of squares within (SSW).
3. Click ‘Calculate’.

Formula & Methodology

The formula for proportional eta squared is:

η² = SSB / (SSB + SSw)

Real-World Examples

Data & Statistics

Example ANOVA Table

Source of Variation	SS	df	MS
Between	SSB	k – 1	MSb
Within	SSW	n – k	MSw
Total	SSB + SSw	n – 1

Expert Tips

• Always ensure your data meets the assumptions of ANOVA before calculating η².
• Interpret η² values with caution, as they can be influenced by sample size.

Interactive FAQ

What are the assumptions of ANOVA?

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For more information, see Statistics How To and Social Research Methods.