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DOI: 10.1177/0095399707303634 Public Service Motivation MeasurementTesting an Abridged Version of Perry's Proposed ScaleArizona State University, Tempe
University of Kansas, Lawrence This article proposes and tests a three-dimension, shortened instrument for public service motivation based on Perry's (1996) exploratory 24-item scale. A confirmatory factor analysis is used with both a diagonally weighted least squares and a modified version of maximum likelihood estimation that are more appropriate for ordinal indicators. Data from the National Administrative Studies Project, consisting of mail surveys of managers engaged in information management activities working in state-level primary health and human service agencies, is used (n = 274; response rate = 53%). Results indicate good support for the shortened scale compared to Perry's original work. Findings corroborate Perry's theorized dimensions and items in the exploratory instrument. An exploratory analysis evaluating modifications to the tested model suggests possible improvements in two dimensions but does not undermine the overall, supportive results and suggests the importance of continued item and scale development.
Key Words: public service motivation public service ethic work motivation measurement theory confirmatory factor analysis formative measures public management
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