A data.frame containing 100 not yet calibrated items with different categorical and metric properties.
Format
A data.frame .
- item
Item identifier.
- diffCategory
Item difficulty (five categories).
- format
Item format (multiple choice, constructed multiple choice, or open answer).
- domain
Item domain (listening, reading, or writing).
- time
Average response times in seconds.
- exclusions
Items which can not be in the same test form.