differential-item-functioning

Test and Item Analysis via Shiny

DIF and DDF Detection by Non-Linear Regression Models.

Code and frozen results for "Are Near-Tied LLM Rankings Robust to Family-DIF-Guided Benchmark Recomposition?" (NeurIPS 2026 TAE Workshop)

Product of Indicators (PI) for MIMIC Models in DIF detection

This package provides a function to detect differential item functioning in a rasch poisson count model.

A reliability and DIF report card for LLM-judge and human-rater scoring instruments.

DIF Book

R code for reproducing the simulations and PIAAC illustration in "Identifying Item Bias Without Conditioning: A Difference-in-Differences Approach".

Which AI model to use, and did the new version get worse, answered with statistical confidence at a tenth of the evaluation calls: item response theory for LLM benchmarks.

An adaptive testing engine: item response theory, maximum-information item selection, live ability estimation, and differential item functioning.