A graphical representation of the mediated effect
Related Experiment Video
Updated: Jul 5, 2026

Characterization of the Sense of Agency over the Actions of Neural-machine Interface-operated Prostheses
Published on: January 7, 2019
Matthew S Fritz1, David P MacKinnon
1Department of Psychology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA. matt.fritz@vt.edu
Abstract:
Mediation analysis is widely used in the social sciences. Despite the popularity of mediation models, few researchers have used graphical methods, other than structural path diagrams, to represent their models. Plots of the mediated effect can help a researcher better understand the results of the analysis and convey these results to others. This article presents a method for creating and interpreting plots of the mediated effect for a variety of mediation models, including models with (1) a dichotomous independent variable, (2) a continuous independent variable, and (3) an interaction between an independent variable and the mediating variable. An empirical example is then presented to illustrate these plots. Sample code for creating plots of the mediated effect in R and SAS is also included, and may be downloaded from www.psychonomic.org/archive.
Related Concept Videos
Methods of Medium Optimization
Pharmacodynamic Models: Logarithmic Concentration–Effect Model
Pharmacodynamic Models: Direct Effect Model and Indirect Response Model
Pharmacodynamic Models: Additive and Proportional Drug Effect Model
Effects of feedback
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
Multiple Bar Graph
Each bar or column in the multiple bar graph represents a data value. These graphs are used primarily in interrelating two or more sets of data. The categories of different kinds of data are listed along the horizontal or x-axis, whereas...