Quality pp 159-192 | Cite as

Summary Measurement: The Role of Categories or Domains



The focus of this chapter is on how the constant stream of information that a person experiences every day is summarized into units that are used to communicate or provide the basis for quantification. Two methods are described: those based on the person using cognitive processes to form categories of information and those that involve the investigator using statistical procedures to create domains. In addition, I describe how the content (modular or nonmodular) of these summary statements can vary and what it implies about the summary measure formed. Finally, I illustrate how differences in the content of a domain and the quality-of-life assessment used (generic or disease specific) contribute to the predictive ability of a quantitative assessment.


Irritable Bowel Syndrome Natural Kind Category Learning Item Bank Category Formation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



Activities of Daily Vision Scale (Manguione et al. 1992)


Computer adaptive testing


Confidence limits


Diagnostic and statistical manual (American Psychiatric Association 2000)


EuroQol group 5 dimensions (Brooks et al. 2003)


Generic quality-of-life assessment


Hospital Anxiety and Depressions Scale (Zigmond and Snaith 1983)


Health-related quality-of-life


Item response theory


Log of minimal angle of resolution


Patient-reported outcomes


Rotterdam symptom checklist (De Haes et al. 1990)


Medical outcome study short form 36 (Ware and Sherbourne 1992)


Physical functioning items of the SF-36


Standard gamble utility measure


Standard gamble-visual health


Sickness Impact Scale (Bergner et al. 1981)


Snellen visual acuity


Subjective well-being


The TyPE specification assesses visual functioning in five dimensions: (1) distance vision; (2) near vision; (3) daytime driving; (4) nighttime driving; and (5) glare


Visual acuity


Visual functioning 14 items (Steinberg et al. 1994)


Vision-specific HRQOL assessment


Verbal utility report


World Health Organization Standards for Vision 2003


Working memory capacity


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Authors and Affiliations

  1. 1.Quality of Life InstituteEast SandwichUSA

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