To rule out the need for a two-parameter item response theory (IRT) model during item analysis by Rasch models, it is important to check the Rasch model's assumption that all items have the same item discrimination. Biserial and polyserial correlation coefficients measuring the association between items and restscores are often used in an informal…

There are few certifying or recertifying examinations in the medical field that are given in a take-home format. This stems from a concern that examinees may discuss items with peers, or save copies of items on the exam and then pass them on to others. This study examined if item exposure on take-home examinations influences the difficulty of the…