Psychometrics with R

Fitting a single factor model

R
psych
lavaan
confirmatory factor analysis
In psychometrics the development of a scale that measures a single latent variable is a very desirable outcome, because it allows for unambiguous interpretation of a total…
Jan 21, 2025
Deon de Bruin

Latent moderation made easy

R
lavaan
structural equation modeling
Kjell Slupphaug recently published the modsem package for R. The package can be used to test hypotheses about moderation (interactions) with latent variables.
Jan 21, 2025
Deon de Bruin

Examining factor similarity across groups

R
psych
exploratory factor analysis
In this tutorial I demonstrate how to examine the similarity of factor solutions across different groups with Tucker’s phi coefficient (aka Burt’s coefficient of…
Jan 21, 2025
Deon de Bruin

How to calculate Cronbach’s coefficient alpha

R
reliability
psych
In this tutorial I demonstrate how to calculate Cronbach’s coefficient alpha. The tutorial consists of four parts:
Jan 21, 2025
Deon de Bruin

Non-parametric item response model plots

R
item response theory
Non-parametric item response modeling makes it possible to gain insight into the functioning of items without placing constraints on the analysis. Ramsay introduced a kernel…
Jan 21, 2025
Deon de Bruin

Randomly divide a sample into two

R
data management
At times an analyst may want to randomly split a sample into two. A common reason might be that the analyst wants to use the data of the first random sample to develop a…
Jan 21, 2025
Deon de Bruin

 

The itemselectr package

R
news
The itemselectr package can be downloaded from my github page. This package contains functions that might be useful for selecting items for inclusion in a psychological test…
Jan 21, 2025
Deon de Bruin

Exploratory factor analysis of the Big Five Inventory: Walkthrough with the psych pagackage

R
exploratory factor analysis
Exploratory factor analysis (EFA) is a statistical technique that researchers use to find the latent structure underlying a set of manifest variables. In the context of…
Jan 21, 2025
Deon de Bruin

Cleaning Excel data

R
The toy data set is captured in an Excel file, which can be downloaded from my Github page. This small data set contains data for 10 persons across nine variables: Person…
Jan 21, 2025
Deon de Bruin

Introduction to exploratory structural equation modeling with the lavaan package

R
lavaan
exploratory factor analysis
structural equation modeling
This document contains a basic example of how one might fit an exploratory structural equation model (esem) with the lavaan package in R. A structural equation model (sem)…
Dec 4, 2024
Deon de Bruin

Missing data? No problem, lavaan has you covered!

R
lavaan
structural equation modeling
confirmatory factor analysis
This document contains a simple demonstration of how researchers can deal with missing data in a structural equation modeling context using the lavaan and lavaan.mi packages…
Dec 4, 2024
Deon de Bruin

Welcome to my blog

news
Welcome to my blog!
Dec 1, 2024
Deon de Bruin
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