Related Experiment Video
Updated: Jul 20, 2026

Problem-Solving Before Instruction (PS-I): A Protocol for Assessment and Intervention in Students with Different Abilities
Published on: September 11, 2021
Mediation analysis
David P MacKinnon1, Amanda J Fairchild, Matthew S Fritz
1Department of Psychology, Arizona State University, Tempe, Arizona 85287-1104, USA. david.mackinnon@asu.edu
Abstract:
Mediating variables are prominent in psychological theory and research. A mediating variable transmits the effect of an independent variable on a dependent variable. Differences between mediating variables and confounders, moderators, and covariates are outlined. Statistical methods to assess mediation and modern comprehensive approaches are described. Future directions for mediation analysis are discussed.
Related Concept Videos
Methods of Medium Optimization
Cognitive Theories: Lazarus Mediational Theory of Emotion
Cognitive Appraisal and Emotional Response
Lazarus proposed that emotions are not solely...
Manipulation and Analysis
Impression Management Techniques IV: Altercasting
Decision Making: P-value Method
First, a specific claim about the population parameter is proposed. The claim is based on the research question and is stated in a simple form. Further, an opposing statement to the claim is also stated. These statements can act as null and alternative hypotheses: a null hypothesis would be a neutral statement while the alternative hypothesis can have a...
The Scientific Method