Software & Demos
Interactive companions and code for my papers. Free-tier apps sleep when idle, so the first load can take a minute.
DIC penalty demo
A parameterization-invariant DIC (2026)
Live Gibbs samplers in the browser: watch the classic DIC penalty collapse under sign switching while the variance-based penalty stays put. The R package DICi computes DIC_i from posterior draws.
CAT Rescoring Explorer
Recovering accuracy from miscalibrated item banks: Scoring error is fixable, selection error is not (2026)
Explore how rescoring with improved item parameters recovers accuracy in miscalibrated CATs: scoring vs selection error, calibration noise and shifts, and test length.
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