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Rasch measurement using dichotomous scoring.

Randall E Schumacker¹

¹P. O. Box 311335, College of Education, University of North Texas, Denton, TX 76203-1335 USA. rschumacker@unt.edu

Journal of Applied Measurement

|July 10, 2004

Summary

This study presents the Rasch measurement model for a new Mobility Scale in older adults. Further development is needed to enhance the scale's activity statements for better measurement.

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Area of Science:

Gerontology
Psychometrics
Rehabilitation Science

Background:

Assessing mobility in independent older adults is crucial for maintaining quality of life.
Existing mobility scales may require refinement for accurate measurement.
The Rasch measurement model offers a robust framework for evaluating measurement properties.

Purpose of the Study:

To present the application of the Rasch measurement model to a newly developed Mobility Scale.
To evaluate the psychometric properties of the Mobility Scale using dichotomous item response data.
To identify areas for improvement in the Mobility Scale for elderly individuals.

Main Methods:

Application of the Rasch measurement model with dichotomous scoring.
Analysis of item response data from independent elderly living individuals.
Evaluation of item and person calibration, logit scale, normative scores, reliability, and validity.

Main Results:

The Rasch model analysis provided insights into the performance of the Mobility Scale items.
Calibration of items and persons on a logit scale was conducted.
Reliability and validity of the scale were assessed based on the model's output.

Conclusions:

The current Mobility Scale requires revisions to improve its measurement accuracy.
Additional activity statements need to be developed and empirically tested.
Further refinement is necessary to enhance the Mobility Scale's utility for assessing older adults' mobility.

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