What is PersonParameters.jl? ​

PersonParameters.jl is a julia package that implements estimation of person parameters for item response models where item parameters are treated as known and fixed. It is developed by the JuliaPsychometrics organization under MIT license.

Installation ​

The package can be installed via julias package management.

] add PersonParameters

How do I use this package? ​

PersonParameters.jl can be used to estimate the person parameters of an item response model with known item parameters. This can be useful when only item parameters are available, e.g. when estimating a model via conditional maximum likelihood, or for online estimation of person abililty in adaptive testing.

It integrates with ItemResponseFunctions.jl so parameters can be estimated for the following models:

Dichotomous response models ​

• 1-Parameter Logistic Model

• 2-Parameter Logistic Model

• 3-Parameter Logistic Model

• 4-Parameter Logistic Model

• 5-Parameter Logistic Model

Polytomous response models ​

• Partial Credit Model

• Generalized Partial Credit Model

• Rating Scale Model

• Generalized Rating Scale Model

For a fully worked example see the Getting started section.