This article offers a 3-parameter model of testing, with 1) the difference between the ability level of the examinee and item difficulty; 2) the examinee discrimination and 3) the item discrimination as model parameters.

It is hard to understand spin-one-half fields without reading Weinberg. This paper is a pedagogical footnote to his formalism with an emphasis on the boost matrix, spinors, and Majorana fields. Learning about Spin-One-Half Fields 2

Since the devastating attacks of September 11, 2001 there have been numerous discussions on the issue of terrorism and terrorist networks, such as al Qaeda, within the media and the intelligence community. At times these discussions have created an image of the terrorist phenomenon as one of a monolithic and unstoppable menace continuing to spread around the world unabated. Lost in these discus...

The use of computer applications can be a frustrating experience. This study replicates previous studies of the amount of time users – involuntarily – spend trying to diagnose and recover from problems they encounter while using computer applications such as web browsers, email, and text processing. In the present study, 21 users self-reported their frustrating experiences during an average of ...