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This post builds on a previous post on Testing Indirect Effects/Mediation in R. What is mediation? There are many ways to define …

Multidimensional Scaling, the precursor to Principal Components Analysis, Common Factor Analysis, and related techniques …

Note I’m not done with this post yet. Don’t trust my content here too much and lower expectations about how much I explain here! …

The image above depicts a sailing ship entering unchartered waters, which I can only guess is a metaphor for the vast natural world …

Introduction I wrote this for psychologists who want to learn how to use R in their research right now. What does a psychologist need …

What is a correlation? A correlation quantifies the linear association between two variables. From one perspective, a correlation has …

What is moderation? Moderation refers to how some variable modifies the direction or the strength of the association between two …

Between-Subjects Factors A between-subjects factor refers to independent groups that vary along some dimension. Put another way, a …

Within-Subjects Design In a within-subjects design, subjects give responses across multiple conditions or across time. In other words, …

What is mediation? There are many ways to define mediation and mediators. Here’s one way: Mediation is the process by which one …