Jean-Paul Fox has an extensive collection of WinBUGS models for Bayesian Item Response Modeling:

http://www.jean-paulfox.com/two/

```
R and WinBUGS-Code ‘Bayesian Item Response Modeling’
Chapter 1: Modeling Examinees' Test Results (Data and Code)
(Test Data) and (Two-Parameter Item response Model)
Chapter 2: Mathematics Placement Test (Data (Ordinal Data Modeling, Johnson and Albert, 1999), Code)
(Placement Test Data (WinBUGS))
(Hierarchical Item Prior (WinBUGS))
(Independent Item Prior (WinBUGS))
(Three-Parameter Simple Prior (WinBUGS))
Chapter 4: TIMMS (2007) Dutch Sixth-Graders Math Achievement
(TIMMS 2007, 6th Graders’ Math Achievement )
(TIMMS 2007, 6th Graders’ Math Achievement Data (include gender))
(TIMMS 2007: Hierarchical Item Prior (WinBUGS))
(TIMMS 2007: Linear Latent Structure (WinBUGS))
Chapter 4: ESS: Measuring Political Interest
(ESS Netherlands: Items Measuring Political Interest )
(ESS: Graded Item Response Model (WinBUGS))
Chapter 5: Dutch Primary School Mathematics Test
(Dutch Primary School Leaving Test )
Chapter 8: Rule-Based Item Test
(Chess Data ())
(Rule-Based Items (Exercise 8.1))
(Rule-Based Items (Exercise 8.3))
(One-Parameter Response-Time Model and Item Response (WinBUGS))
(One-Parameter Response-Time Model and Item Responses (WinBUGS))
```