### Centering in Moderation Analysis: A Guide

R

statistics

code

datawaizard

moderation

interactions

This blog post will cover what centering is, what a sum-to-zero contrast is, why and when you should use them, and how you can do them in

**. Specifically, we will focus on…**`R`

### Ordinal Regression as a Model for Signal Detection

R

statistics

code

ordinal regression

signal detection theory

I was basically done with this blog post when I came across Matti Vuorre’s post on the same exact topic. Matti goes into

*all*the details, and really the present post can be…### Everything You Always Wanted to Know About ANOVA*

(*But Were Afraid to Ask)

statistics

R

regression

ANOVA

interactions

linear models

code

glm

Analysis of variance (ANOVA) is a statistical procedure, developed by R. A. Fisher, used to analyze the relationship between a continuous outcome (dependent variable) and…

### (What to do) When Predictors Co-Vary

statistics

R

emmeans

code

glm

multicollinearity

assumptions

Co-varying predictors can be a messy business. They make estimates unstable, reducing our statistical power and making interpretation more difficult. In this post I will…

### The Mysterious Case of the Ghost Interaction

R

statistics

ANOVA

code

linear mixed models

_{This spooky post was written in collaboration with Yoav Kessler (@yoav_kessler) and Naama Yavor (@namivor).}.

### (Bootstrapping) Follow-Up Contrasts for Within-Subject ANOVAs (part 2)

R

statistics

ANOVA

bootstrap

code

mixed-design

permutation

A while back I wrote a post demonstrating how to

*bootstrap*follow-up contrasts for repeated-measure ANOVAs for cases where you data violates some / any assumptions. Here is…### Signal Detection Theory vs. Logistic Regression

R

statistics

code

logistic regression

signal detection theory

I recently came across a paper that explained the equality between the parameters of signal detection theory (SDT) and the parameters of logistic regression in which the…

### (Bootstrapping) Follow-Up Contrasts for Within-Subject ANOVAs

R

statistics

ANOVA

bootstrap

code

mixed-design

permutation

So you’ve run a repeated-measures ANOVA and found that your residuals are neither normally distributed, nor homogeneous, or that you are in violation of any other assumptions…

### Common Practice (misuse of) Moderation in Regression

statistics

assumptions

interactions

linear models

moderation

regression

… or how I stopped trusting standardized coefficients.

### What ARE the Assumptions of Linear Regression?

statistics

assumptions

linear models

regression

When you assume,

you make an ass out of you and me.

you make an ass out of you and me.

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