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ERIC Number: ED464096
Record Type: Non-Journal
Publication Date: 2002-Apr
Pages: 23
Abstractor: N/A
Reference Count: N/A
Effects of Decreasing the Number of Common Items in Equating Link Item Sets.
Hanick, Patricia L.; Huang, Chi-Yu
The term "equating" refers to a statistical procedure that adjusts test scores on different forms of the same examination so that scores can be interpreted interchangeably. This study examines the impact of equating with fewer items than originally planned when items have been removed from the equating set for a variety of reasons. A real data set from a licensure/certification examination was used for the study. Three linear equating methods and three test forms were involved. The sample size for each of the test forms was at least 10,000 examinees. Item sets were manipulated to discard different numbers of items. The scale scores computed using the decreased sets of equators were either unchanged or one point higher or lower than the scale scores computed using the original set of equators. The scale score fluctuations in nearly all of the decreased equating sets affected the passing scores of approximately two percent of the examinees, either increasing or decreasing the required scale score by one point. For a set in which two scale scores varied rather than just one, approximately four percent of the examinees were affected. Findings show that the equating plan designed for this examination was highly robust. (SLD)
Publication Type: Reports - Research; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A