David P. MacKinnon

Methods for testing theory and evaluating impact in randomized field trials: Intent-to-treat analyses for integrating the perspectives of person, place, and time

Confidence Limits for the Indirect Effect: Distribution of the Product and Resampling Methods

The most commonly used method to test an indirect effect is to divide the estimate of the indirect effect by its standard error and compare the resulting z statistic with a crit...

A Simulation Study of Mediated Effect Measures

Analytical solutions for point and variance estimators of the mediated effect, the ratio of the mediated to the direct effect, and the proportion of the total effect that is med...

Demonstration and evaluation of a method for assessing mediated moderation

A mediated moderation model of cigarette use among Mexican American youth

Mediation Analysis

Abstract Mediating variables are prominent in psychological theory and research. A mediating variable transmits the effect of an independent variable on a dependent variable. Di...

Required Sample Size to Detect the Mediated Effect

Mediation models are widely used, and there are many tests of the mediated effect. One of the most common questions that researchers have when planning mediation studies is, “Ho...

Equivalence of the Mediation, Confounding and Suppression Effect

Estimating Mediated Effects in Prevention Studies

The purpose of this article is to describe statistical procedures to assess how prevention and intervention programs achieve their effects. The analyses require the measurement ...

Distribution of the product confidence limits for the indirect effect: Program PRODCLIN

Multilevel Modeling of Individual and Group Level Mediated Effects

This article combines procedures for single-level mediational analysis with multilevel modeling techniques in order to appropriately test mediational effects in clustered data. ...

Investigation of Mediational Processes Using Parallel Process Latent Growth Curve Modeling

This study investigated a method to evaluate mediational processes using latent growth curve modeling. The mediator and the outcome measured across multiple time points were vie...

R 2 effect-size measures for mediation analysis

A comparison of methods to test mediation and other intervening variable effects.

A Monte Carlo study compared 14 methods to test the statistical significance of the intervening variable effect. An intervening variable (mediator) transmits the effect of an in...