Nathan A. Thompson

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PURPOSE To compare ophthalmic practice productivity and performance attributes, as rated by employing ophthalmologists, of noncertified and three levels of certified ophthalmic medical personnel. METHODS Three hundred eighty-five American and Canadian ophthalmologists in a clinic-based, stratified, random sample were surveyed regarding productivity(More)
A well-known stopping rule in adaptive mastery testing is to terminate the assessment once the examinee’s ability confidence interval lies entirely above or below the cut-off score. This article proposes new procedures that seek to improve such a variable-length stopping rule by coupling it with curtailment and stochastic curtailment. Under the new(More)
A substantial amount of research has been conducted over the past 40 years on technical aspects of computerized adaptive testing (CAT), such as item selection algorithms, item exposure controls, and termination criteria. However, there is little literature providing practical guidance on the development of a CAT. This paper seeks to collate some of the(More)
This study aimed at examining the issues affecting the use of IRT models in investigating differential item functioning in high stakes testing. It specifically focused on the Iranian National University Entrance Exam (INUEE) Special English Subtest. A sample of 200,000 participants was randomly selected from the candidates taking part in the INUEE 2003 and(More)