Archives of Physical Medicine and Rehabilitation · 1993 · 560 citations · 9 references
EducationRehabilitation MedicineDisabilityFunctional AssessmentPhysical DisabilitiesDisability AssessmentDisability EvaluationFunctional ImpairmentFunctional IndependenceFunctional Independence AssessmentFunctional StatusFunctional Capacity DeclineFunctional Impairment SeverityFunctional Independence MeasureFunctional Limitations IndicatorsSelf-reported Functional Capacity
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Observations are always ordinal; measurements, however, must be interval.
BD Wright, J M Linacre · PubMed · 1989 · 681 citations
Ordinal scales and foundations of misinference.
Charles T. Merbitz, James R. Morris, Jeffrey C. Grip · PubMed · 1989 · 485 citations