Instrument development tools and activities for measure validation using Rasch models: part II--validation activities.

Abstract

Accumulation of validity evidence is an important part of the instrument development process. In Part I of a two-part series, we provided an overview of validity concepts and described how instrument development efforts can be conducted to facilitate the development of validity arguments. In this, Part II of the series, we identify how analyses, especially those conducted within a Rasch measurement framework, can be used to provide evidence to support validity arguments that are founded during the instrument development process.

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