Using Rasch Measurement to Revisit Survey Checklist Items

An introduction to multidimensional measurement using Rasch models.

The act of constructing a measure requires a number of important assumptions. Principle among these assumptions is that the construct is unidimensional. In practice there are many instances when the assumption of unidimensionality does not hold, and where the application of a multidimensional measurement model is both technically appropriate and substantively advantageous. In this paper we illu...

Realizing a Rasch measurement through instructionally- sequenced domains of test items

This paper presents results from a project in which instructionally-sequenced domains were defined for purposes of constructing measures that that conform to an ideal in Guttman scaling and Rasch measurement. A fundamental idea in these measurement systems is that every person higher on the measurement scale can do everything that lower-level persons can do, plus at least one more thing. This i...

Introduction to Many-Facet Rasch Measurement - Preamble

Many-Facet Rasch Measurement

This chapter provides an introductory overview of many-facet Rasch measurement (MFRM). Broadly speaking, MFRM refers to a class of measurement models that extend the basic Rasch model by incorporating more variables (or facets) than the two that are typically included in a test (i.e., examinees and items), such as raters, scoring criteria, and tasks. Throughout the chapter, a sample of rating d...

Using Rasch analysis to revisit the validity of the Cataract TyPE Spec instrument for measuring cataract surgery outcomes.

PURPOSE To assess the psychometric properties of the Cataract TyPE Specification (Spec) questionnaire using the Rasch model. SETTING Flinders Medical Centre, Adelaide, Australia. METHODS The 12-item Cataract TyPE Spec questionnaire was self-administered to patients drawn from the cataract surgery waiting list. The questionnaire and its 5 subscales were assessed for fit to the Rasch model. R...