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Nature of Science Construct: One Dimension or Five?

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Nature of Science Construct: One Dimension or Five?

Автор: Shelagh Peoples

Описание:

This book guides readers on how to assess the dimensionality of a construct that has been developed within a Rasch-based measurement system. The Rasch model is a prescriptive model. If the data ‘fit the model’, items and respondents are placed on a common, interval-level linear scale that enables items and respondents to be analyzed qualitatively and statistically. A major assumption of the Rasch model is that the construct is unidimensional. The theoretical framework for the ‘Nature of Science’ (NOS) construct suggests it is composed of several dimensions that are separate but inter-related. Using data from an instrument designed to measure elementary students’ understanding of NOS; this book walks you through (step-by-step) on how to assess a construct’s dimensionality and build a validity argument to justify the use of scores from a Rasch-based instrument. This book will interest instrument developers who want to apply the Rasch model for survey design, development and measurement….

Издатель: LAP Lambert Academic Publishing

Год: 2013

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