An introduction to item response theory for health behavior researchersAmerican Journal of Health Behavior (2012)
To introduce item response theory (IRT) to health behavior researchers by contrasting it with classical test theory and providing an example of IRT in health behavior.
Demonstrate IRT by fitting the 2PL model to substance-use survey data from the Adolescent Health Risk Behavior questionnaire (n=1343 adolescents).
An IRT 2PL model can produce viable substance use scores that differentiate different levels of substance use, resulting in improved precision and specificity at the respondent level.
IRT is a viable option for health researchers who want to produce high-quality scores for unidimensional constructs. The results from our example-although not flawless-demonstrate the feasibility of IRT in health behavior research.
- item response theory,
- survey research,
Publication DateJanuary, 2012
Citation InformationRussell T Warne. "An introduction to item response theory for health behavior researchers" American Journal of Health Behavior Vol. 36 Iss. 1 (2012)
Available at: http://works.bepress.com/rwarne/14/