Test-retest reliability of willingness to pay.
We describe the results of a survey designed to assess the test-retest reliability of a method of establishing willingness to pay. Willingness to pay values for a hypothetical intervention were elicited from a randomly selected, population sample by face-to-face interview on three occasions over a period of 5 weeks. Test-retest reliability was assessed by intraclass correlation and by generalizability analysis. Reliability was acceptable but not substantial, and there was a statistically significant shift in mean value between first and second assessments. The greatest source of variation in values was the participants. There was also a substantial interaction between time and participants, suggesting that some respondents changed their answers at follow-up. The results were sensitive to the high valuations provided by four of the participants, however.
Shiell
Alan
A
Department of Community Health Sciences, University of Calgary, Canada. ashiell@ucalgary.ca
Hawe
Penelope
P
D001315:Australia; D005382:Financing, Personal / Q000191:economics*; D015438:Health Behavior; D006296:Health Services / Q000191:economics*; D006304:Health Status; D006801:Humans; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D013997:Time Factors