Maintaining instrument quality while reducing items: application of Rasch analysis to a self-report of visual function.

@article{Velozo2000MaintainingIQ,
  title={Maintaining instrument quality while reducing items: application of Rasch analysis to a self-report of visual function.},
  author={Craig A Velozo and Jin-Shei Lai and Trudy Mallinson and E Hauselman},
  journal={Journal of outcome measurement},
  year={2000},
  volume={4 3},
  pages={667-80}
}
While efficiency has been of concern in the measurement of health care outcomes, little attention has been devoted to methods that achieve efficient, shortened instruments that have good psychometric properties. The purpose of this study was to show how Rasch analysis could be used to reduce the number of items in an instrument while maintaining credible psychometric properties. This approach was applied to the Visual Function-14 (VF-14), a self-report of 14 vision-dependent activities… CONTINUE READING

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