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ERIC Number: EJ1006851
Record Type: Journal
Publication Date: 2013-Jan
Pages: 6
Abstractor: As Provided
Reference Count: 8
ISBN: N/A
ISSN: ISSN-0146-6216
A Note on Specifying the Guessing Parameter in ATFIND and DIMTEST
Socha, Alan; DeMars, Christine E.
Applied Psychological Measurement, v37 n1 p87-92 Jan 2013
The software program DIMTEST can be used to assess the unidimensionality of item scores. The software allows the user to specify a guessing parameter. Using simulated data, the effects of guessing parameter specification for use with the ATFIND procedure for empirically deriving the Assessment Subtest (AT; that is, a subtest composed of items that potentially measure a second dimension) and DIMTEST for assessing whether that AT represents a second dimension were investigated. Results suggest that specifying higher guessing parameters in ATFIND and DIMTEST result in higher Type I error rates. (Contains 3 figures.)
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: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A