ERIC Number: ED364573
Record Type: RIE
Publication Date: 1993-Apr
Reference Count: N/A
Generalizability Theory and Many-Facet Rasch Measurement.
Linacre, John M.
Generalizability theory (G-theory) and many-facet Rasch measurement (Rasch) manage the variability inherent when raters rate examinees on test items. The purpose of G-theory is to estimate test reliability in a raw score metric. Unadjusted examinee raw scores are reported as measures. A variance component is estimated for the examinee distribution. Other variance components, due to item and rater distributions, interaction effects and random noise, are accumulated as examinee score error. Rasch computes a measure for each examinee, adjusted for the particular items and raters met by that examinee, that is more fair than the raw score. Rasch test reliability is higher than G-theory reliability because Rasch error variance excludes item and judge variance. (Contains 4 references.) (Author)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Authoring Institution: N/A
Identifiers: Many Faceted Rasch Model; Rasch Model
Note: Paper presented at the Annual Meeting of the American Educational Research Association (Atlanta, GA, April 12-16, 1993).