Mediation Effect Size Calculator

Formula

The formula to calculate the Mediation Effect Size (ab) is:

\[ ab = c - c' \]

Where:

\( ab \) is the mediation effect size
\( c \) is the total effect of the independent variable on the dependent variable
\( c' \) is the direct effect of the independent variable on the dependent variable after accounting for the mediator

What is Mediation Effect Size?

Mediation effect size represents the indirect effect of an independent variable on a dependent variable through a mediator variable. It is a key concept in mediation analysis, which is used to understand how and why certain effects occur. The mediation effect size helps in quantifying the proportion of the total effect that is mediated.

Example Calculation

Let's assume the following values:

Total Effect (c) = 0.8
Direct Effect (c’) = 0.5

Using the formula to calculate the Mediation Effect Size:

\[ ab = 0.8 - 0.5 = 0.3 \]

The Mediation Effect Size (ab) is 0.3.