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How Many Alternatives Can Be Ranked? A Comparison of the Paired Comparison and Ranking Methods

Title
How Many Alternatives Can Be Ranked? A Comparison of the Paired Comparison and Ranking Methods
Authors
Ock, MinsuYi, NariAhn, JeonghoonJo, Min-Woo
Ewha Authors
안정훈
SCOPUS Author ID
안정훈scopus
Issue Date
2016
Journal Title
VALUE IN HEALTH
ISSN
1098-3015JCR Link1524-4733JCR Link
Citation
vol. 19, no. 5, pp. 655 - 660
Keywords
consistencydiscrete choice experimentspaired comparisonranking
Publisher
ELSEVIER SCIENCE INC
Indexed
SCIE; SSCI; SCOPUS WOS scopus
Abstract
Objectives: To determine the feasibility of converting ranking data into paired comparison (PC) data and suggest the number of alternatives that can be ranked by comparing a PC and a ranking method. Methods: Using a total of 222 health states, a household survey was conducted in a sample of 300 individuals from the general population. Each respondent performed a PC 15 times and a ranking method 6 times (two attempts of ranking three, four, and five health states, respectively). The health states of the PC and the ranking method were constructed to overlap each other. We converted the ranked data into PC data and examined the consistency of the response rate. Applying probit regression, we obtained the predicted probability of each method. Pearson correlation coefficients were determined between the predicted probabilities of those methods. The mean absolute error was also assessed between the observed and the predicted values. Results: The overall consistency of the response rate was 82.8%. The Pearson correlation coefficients were 0.789, 0.852, and 0.893 for ranking three, four, and five health states, respectively. The lowest mean absolute error was 0.082 (95% confidence interval [CI] 0.074-0.090) in ranking five health states, followed by 0.123 (95% CI 0.111-0.135) in ranking four health states and 0.126 (95% CI 0.113-0.138) in ranking three health states. Conclusions: After empirically examining the consistency of the response rate between a PC and a ranking method, we suggest that using five alternatives in the ranking method may be superior to using three or four alternatives.
DOI
10.1016/j.jval.2016.03.1836
Appears in Collections:
신산업융합대학 > 융합보건학과 > Journal papers
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