Download eBook for Free

FormatFile SizeNotes
PDF file 0.3 MB

Use Adobe Acrobat Reader version 10 or higher for the best experience.

The use of anchoring vignettes to correct for differential item functioning rests upon two identifying assumptions: vignette equivalence and response consistency. To test the second assumption the authors conduct an experiment in which respondents in an Internet panel are asked to both describe their health in a number of domains and rate their health in these domains. In a subsequent interview respondents are shown vignettes that are in fact descriptions of their own health. Under response consistency and some auxiliary assumptions with regard to the validity of the experiment, there should be no systematic differences between the evaluation of these vignettes in the second interview and the self-evaluations in the first interview. They analyze data for five health domains: sleep, mobility, concentration, breathing and affect. Although descriptively the vignettes and the self-evaluations are similar for a number of domains, their nonparametric analysis suggests that response consistency is satisfied for the domain of sleep, while it indicates rejection of either the auxiliary assumptions or response consistency for the other domains of health. Parametric analysis suggests that the auxiliary assumptions may be most problematic. The analysis points at the need for a systematic experimental approach to the design of anchoring vignettes before using them in practice.

Research conducted by

This paper series was made possible by the NIA funded RAND Center for the Study of Aging and the NICHD funded RAND Population Research Center.

This report is part of the RAND Corporation working paper series. RAND working papers are intended to share researchers' latest findings and to solicit informal peer review. They have been approved for circulation by RAND but may not have been formally edited or peer reviewed.

Permission is given to duplicate this electronic document for personal use only, as long as it is unaltered and complete. Copies may not be duplicated for commercial purposes. Unauthorized posting of RAND PDFs to a non-RAND Web site is prohibited. RAND PDFs are protected under copyright law. For information on reprint and linking permissions, please visit the RAND Permissions page.

The RAND Corporation is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.