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ERIC Number: EJ918790
Record Type: Journal
Publication Date: 2011-Apr
Pages: 9
Abstractor: As Provided
Reference Count: 25
ISBN: N/A
ISSN: ISSN-0013-1644
A New Method for Estimating the Variance Overlap between the Short and the Long Form of a Psychological Test
Pfeiffer, Nils; Hagemann, Dirk; Backenstrass, Matthias
Educational and Psychological Measurement, v71 n2 p380-388 Apr 2011
In response to the low standards in short form development, Smith, McCarthy, and Anderson (2000) introduced a set of guidelines for the construction and evaluation of short forms of psychological tests. One of their recommendations requires researches to show that the variance overlap between the short form and its long form is adequate. This article introduces a new method for estimating this variance overlap. Subjects are randomly assigned to four different groups that are tested with different combinations of the long and the short form. This procedure makes it possible to estimate the effects that attenuate the variance overlap between the short and the long form. By controlling for these effects, the disattenuated coefficient VO gives an unbiased estimate of the variance overlap between both instruments. (Contains 1 table.)
SAGE Publications. 2455 Teller Road, Thousand Oaks, CA 91320. Tel: 800-818-7243; Tel: 805-499-9774; Fax: 800-583-2665; e-mail: journals@sagepub.com; Web site: http://sagepub.com
Publication Type: Journal Articles; Reports - Research
Education Level: Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A