Questionnaire discrimination: (re)-introducing coefficient δ
Open Access
- 18 May 2007
- journal article
- Published by Springer Nature in BMC Medical Research Methodology
- Vol. 7 (1) , 19
- https://doi.org/10.1186/1471-2288-7-19
Abstract
Questionnaires are used routinely in clinical research to measure health status and quality of life. Questionnaire measurements are traditionally formally assessed by indices of reliability (the degree of measurement error) and validity (the extent to which the questionnaire measures what it is supposed to measure). Neither of these indices assesses the degree to which the questionnaire is able to discriminate between individuals, an important aspect of measurement. This paper introduces and extends an existing index of a questionnaire's ability to distinguish between individuals, that is, the questionnaire's discrimination.Keywords
This publication has 4 references indexed in Scilit:
- Performance of health-status scales when used selectively or within multi-scale questionnaireBMC Medical Research Methodology, 2003
- Statistics and the Theory of MeasurementJournal of the Royal Statistical Society Series A: Statistics in Society, 1996
- A Theory of Consistency of Ordering Generalizable to Tailored TestingPsychometrika, 1977
- On the Theory of Test DiscriminationPsychometrika, 1949