ERIC Number: ED194636
Record Type: RIE
Publication Date: 1980-May
Reference Count: 0
An Introduction to Rasch Measurement and Its Application to Test Equating in the Comprehensive Assessment Program.
Engelhard, George, Jr.
The Rasch model is described as a latent trait model which meets the five criteria that characterize reasonable and objective measurements of an individual's ability independent of the test items used. The criteria are: (1) calibration of test items must be independent of particular norming groups; (2) measurement of individuals must be independent of particular items used for measuring; (3) test items must measure a single underlying trait or ability; (4) a more able individual must have a better chance of success with an item than a less able individual; and (5) an individual must have a better chance of success on an easy item than on a difficult item. To illustrate the use of the Rasch model for vertical equating, equal interval scales (EIS) were developed and applied to the Scott, Foresman Comprehensive Assessment Program (CAP), a coordinated series of tests and measures for evaluating students' educational growth. (Author/MH)
Publication Type: Speeches/Meeting Papers; Reports - Research
Education Level: N/A
Authoring Institution: N/A
Identifiers: Comprehensive Assessment Program; Rasch Model; Unidimensional Scaling; Vertical Equating
Note: Paper presented at the Annual Meeting of the Northern Illinois Association for Educational Research, Evaluation and Development (4th, Bloomingdale, IL, May 9, 1980).