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Below you will find descriptions and links to 5 free statistics calculators for computing values associated with statistical mediation studies.

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This calculator will compute the indirect effect of a mediation model, given the regression coefficient between the independent variable and the mediator variable and the regression coefficient between the mediator variable and the dependent variable.

This calculator will compute the 99%, 95%, and 90% confidence intervals for an indirect mediation effect, given the regression coefficient and standard error for the relationship between the independent variable and the mediator, and the regression coefficient and standard error for the relationship between the mediator and the dependent variable.

This calculator uses the Sobel test to tell you whether a mediator variable significantly carries the influence of an independent variable to a dependent variable; i.e., whether the indirect effect of the independent variable on the dependent variable through the mediator variable is significant. This calculator returns the Sobel test statistic, and both one-tailed and two-tailed probability values.

This calculator will compute the total effect of a mediation model, given the regression coefficient between the independent variable and the mediator variable, the regression coefficient between the mediator variable and the dependent variable, and the regression coefficient between the independent variable and the dependent variable.

This calculator uses Sobel's multivariate delta method to compute the variance of an indirect effect in a mediation model, given the regression coefficient and standard error for the relationship between the independent variable and the mediator, and the regression coefficient and standard error for the relationship between the mediator and the dependent variable.