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Rack and Stack

Rack and Stack. The Structure and Stability of the Functional Independence Measure (FIM). http://www.rasch.org/memo50.htm Cites sources regarding deficiencies of raw score analysis of scales http://www.rasch.org/rmt/rmt103e.htm Defends use of Rasch to analyze these data for a critic.

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Rack and Stack

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  1. Rack and Stack

  2. The Structure and Stability of the Functional Independence Measure (FIM) http://www.rasch.org/memo50.htm • Cites sources regarding deficiencies of raw score analysis of scales http://www.rasch.org/rmt/rmt103e.htm • Defends use of Rasch to analyze these data for a critic

  3. This concept can be applied elsewhere • Comparing people over time (how much people improve after intervention) • Comparing items over time (how much easier items become after intervention) • “Rack and Stack” Example: www.raschsig.org/rmt171.pdf

  4. To look at person change: Stack • Items are modeled to maintain their difficulties across the two time points, and the persons are entered twice, once at admission to rehabilitation and once at discharge from it. • Changes in patient independence can be identified by cross-plotting the admission and discharge measures for each patient, as in example 12 or looking at the difference in measures Time 1 Time 2

  5. To look at item change: Rack • To look at WHAT has changed instead of WHO has changed. • Items are entered twice, once at admission to rehabilitation and once at discharge from it. Items Items(again) Time 1 Time 2 Persons

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