Rasch analysis of the Functional Independence Measure (FIM) Mastery Test

Archives of Physical Medicine and Rehabilitation
C V GrangerR T Linn

Abstract

To evaluate the range, distribution, and unidimensionality of the items included in Version Five of the Functional Independence Measure (FIM) Mastery Test, a 54-item written examination used to determine FIM rating proficiency by professionals who administer the instrument. Rasch analysis of the test results of 6,645 clinicians who took the FIM Mastery Test in 1996. Overall, clinicians performed well on the test. When the mean item difficulty was centered at 50, and the test scores were calibrated to range from 0 to 100 logits, the mean person ability level was 77 logits. Fit statistics indicated that the test was unidimensional, measuring a common theme. While the item separation index value was 17, 22 items were not efficient in determining the clinicians' ability levels. Analysis of the logit values by the correct response showed that descriptions of Total Assistance (Level 1) and Complete Independence (Level 7) were easiest for clinicians to score correctly. The examination measures the common theme of FIM knowledge in a consistent manner. Further, the results suggest that the FIM Mastery Test may be shortened, perhaps by eliminating one of the three case studies, and improved by adding more challenging questions. In additi...Continue Reading

References

May 1, 1996·American Journal of Physical Medicine & Rehabilitation·M E SegalR Schall
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