DataAnalysis/irt.qmd at main · DevPsyLab/DataAnalysis · GitHub

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---
title: "Item Response Theory"
---

# Overview

<https://isaactpetersen.github.io/Principles-Psychological-Assessment/item-response-theory.html>

# Analysis examples

## 1-parameter logistic model

<https://isaactpetersen.github.io/Principles-Psychological-Assessment/item-response-theory.html#sec-irt-onePL>

## 2-parameter logistic model

<https://isaactpetersen.github.io/Principles-Psychological-Assessment/item-response-theory.html#sec-irt-twoPL>

## 2-parameter multi-dimensional logistic model

<https://isaactpetersen.github.io/Principles-Psychological-Assessment/item-response-theory.html#sec-irt-twoPLmultidimensional>

## 3-parameter logistic model

<https://isaactpetersen.github.io/Principles-Psychological-Assessment/item-response-theory.html#sec-irt-threePL>

## 4-parameter logistic model

<https://isaactpetersen.github.io/Principles-Psychological-Assessment/item-response-theory.html#sec-irt-fourPL>

## Graded response model

<https://isaactpetersen.github.io/Principles-Psychological-Assessment/item-response-theory.html#sec-irt-gradedResponseModel>