Hostname: page-component-7b7567c8c-2rsb6 Total loading time: 0 Render date: 2026-11-12T08:00:33.589Z Has data issue: false hasContentIssue false

Reducing Measurement Error in Student Achievement Estimation

Published online by Cambridge University Press:  01 January 2025

Michela Battauz*
Affiliation:
Department of Statistics, University of Udine
Ruggero Bellio
Affiliation:
Department of Statistics, University of Udine
Enrico Gori
Affiliation:
Department of Statistics, University of Udine
*
Requests for reprints should be sent to Michela Battauz, University of Udine, Department of Statistics, Via Treppo 18, 33100 Udine, Italy. E-mail: battauz@dss.uniud.it

Abstract

The achievement level is a variable measured with error, that can be estimated by means of the Rasch model. Teacher grades also measure the achievement level but they are expressed on a different scale. This paper proposes a method for combining these two scores to obtain a synthetic measure of the achievement level based on the theory developed for regression with covariate measurement error. In particular, the focus is on ordinal scaled grades, using the SIMEX method for measurement error correction. The result is a measure comparable across subjects with smaller measurement error variance. An empirical application illustrates the method.

Information

Type
Theory and Methods
Copyright
Copyright © 2007 The Psychometric Society

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable