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Published on: September 4, 2019
Detecting Examinees With Item Preknowledge on Real Data
Dmitry I Belov1, Sarah L Toton2
1Psychometric Research, Law School Admission Council, Newtown, PA, USA.
Abstract:
Recently, Belov & Wollack (2021) developed a method for detecting groups of colluding examinees as cliques in a graph. The objective of this article is to study how the performance of their method on real data with item preknowledge (IP) depends on the mechanism of edge formation governed by a response similarity index (RSI). This study resulted in the development of three new RSIs and demonstrated a remarkable advantage of combining responses and response times for detecting examinees with IP. Possible extensions of this study and recommendations for practitioners were formulated.

