Sobel Test Calculator for Significance of Mediation

A sobel test is used to determine whether or not the indirect effect of an independent variable on a dependent variable through a mediator variable is significant. A sobel test uses the following formula to calculate a test statistic:
Sobel test statistic = (a*b) /√(b2*sa2 + a2*sb2)
where a is the raw regression coefficient for the association between the independent variable and the mediator, sa is the standard error of a, b is the raw coefficient for the association between the mediator and the dependent variable, and sb is the standard error of b.
To conduct a sobel test, simply fill in the values below and then click the “Calculate” button.

Sobel test statistic: 2.306820

One-tailed probability: 0.010532

Two-tailed probability: 0.021065

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