Example Data Files
jMetrik is tested using a variety of data files including the files listed below. Use them to practice with jMetrik and verify your work. More example data files will be added in the future. To download a file, right click on the link and select "Save Link Aa..." or "Save Target As..."
Exam1 - A data file of 6,000 cases and 56 binary items.
- Data
- README (Provides answer key and other information)
- Item analysis results
- DIF analysis results
- Frequency analysis results
Exam 2 - A data file of 500 cases and 20 polytomous items
- Data
- README (Provides answer key and other information)
- Frequency analysis results
- Descriptive statistics results
- Item analysis results
Exam 3 - A data file of 500 cases and 20 binary items and 5 polytomous items
- Data
- README (Provides answer key and other information)
- Frequency analysis results
- Descriptive statistics results
- Correlation results (listwise deletion)
- Correlation results (pairwise deletion)
- Item analysis results
- DIF analysis results
DIF1 - A data file of 2,000 cases and 60 binary items and 5 polytomous items
- Data
- README (Provides answer key and other information)
- Item analysis results
- DIF analysis results
Equating 1 - Common item equating using 11 common items and a Rasch model (Equate Form X to the scale of Form Y)
Equating 2 - Common item equating using 11 common items from a 3 Parameter logistic model (Equate Form X to the scale of Form Y). Note: these data were obtained from the STUIRT program data (http://www.education.uiowa.edu/casma/computer_programs.htm#equating).
- Item data - both forms
- Person data - both forms
Equating 3 - Raw item response data for two test forms. Form X contains 20,000 examinee responses to 50 items. Form Y contains 25,000 examinee responses to 50 items.