Item Response Theory
2 Analysis examples
2.1 1-parameter logistic model
https://isaactpetersen.github.io/Principles-Psychological-Assessment/irt.html#irt-onePL
2.2 2-parameter logistic model
https://isaactpetersen.github.io/Principles-Psychological-Assessment/irt.html#irt-twoPL
2.3 2-parameter multi-dimensional logistic model
2.4 3-parameter logistic model
https://isaactpetersen.github.io/Principles-Psychological-Assessment/irt.html#irt-threePL
2.5 4-parameter logistic model
https://isaactpetersen.github.io/Principles-Psychological-Assessment/irt.html#irt-fourPL
2.6 Graded response model
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