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ERIC Number: EJ797671
Record Type: Journal
Publication Date: 2007-Mar
Pages: 18
Abstractor: As Provided
Reference Count: 44
ISSN: ISSN-1937-6928
The Effect of Asymmetry on the 2x2 Kappa Coefficient: Application to the Study of Learning Disabilities
Rivas-Moya, Teresa; Gonzalez-Valenzuela, Maria-Jose
Learning Disabilities: A Contemporary Journal, v5 n1 p59-76 Mar 2007
In educational practice, for the evaluation and diagnosis of learning disabilities (LD), it is advisable to use standardized tests together with observation questionnaires. When observation questionnaires are used in the study of LD, Cohen's (1960) kappa coefficient (k) is frequently applied as a measure of agreement between two raters when they independently classify a sample of subjects in several categories. In practice, a good interpretation cannot be made if the conditions surrounding the calculation are not taken into consideration. This investigation presents a study of asymmetry and its effect on the k interpretation. In Study 1, the importance of symmetry is highlighted by means of several examples that show agreement between two raters when classifying 60 subjects in one of two categories. From these examples the interpretation of k is complemented with the information given by (a) asymmetry analyzed by descriptive and graphical methods and hypothesis tests; and (b) other values, such as maximum observed agreement, maximum reachable agreement, and maximum unreachable agreement. In Study 2, the concepts of Study 1 are applied to examples of LD. (Contains 7 tables and 3 figures.)
Learning Disabilities Worldwide, Inc. P.O. Box 142, Weston, MA 02493. Tel: 781-890-5399; Fax: 781-890-0555; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A