This book introduces current perspectives on Rasch measurement theory with an emphasis on developing Rasch-based scales. Rasch measurement theory represents a paradigm shift in measurement theory away from classical test theory and creates a framework for scaling that can yield invariant measurement. Rasch Models for Solving Measurement Problems: Invariant Measurement in the Social Sciences is a broadly accessible text. Authors George Engelhard Jr and Jue Wang introduce Rasch measurement theory step by step, with chapters on scale construction, evaluation, maintenance, and use. The Rasch analyses in the book are run using the Facets computer program. Facets syntax, and R code for the ERMA program created by the authors to obtain parameter estimates and to examine model-data fit, together with sample data sets are all available on a website for the book.

Resources from the book are available below:

Facets syntax

• Chapter 2 FACETS syntax.txt
• Chapter 3 FACETS syntax.txt

Data sets

• FIES Data.txt -- Food Insecurity Scale (US Data; N = 40)

R code

• Shiny R program.doc

Acknowledgments

We gratefully acknowledge George Engelhard Jr and Jue Wang for writing an excellent text and providing these materials.