Small simulated item pool example.

A data.frame containing 165 items calibrated using a 3PL model. This item pool is analogous to one of the item pools used in Diao & van der Linden (2011).

Usage

items_diao

Format

A data.frame .

item

Item identifier.

a

Discrimination parameter.

b

Difficulty parameter.

c

Pseudo-guessing parameter.

category

Content category.

References

Diao, Q. & van der Linden, W.J. (2011). Automated test assembly using lp_solve version 5.5 in R. Applied Psychological Measurement, 35 (5), 398-409.