Caso, D., & Iannario, M.
Modeling intention of HPV vaccination by means of a class of mixture models for ordinal data
Aim of the paper is to deal by means of a mixture model for the analysis of rating data several psychological factors which influence the decision process of vaccination achieved by mothers for their 12-year-old daughters. The psychological theoretical framework is the Health Action Process Approach (HAPA) model, which allows to investigate goal intention considering risk perception, outcome expectation, and self-efficacy. Specifically, the study intends to explore how these psychological factors plus knowledge, socio-demographic characteristics (job, religion, political orientation, education), and common practices contribute to develop the process of intention expressed on a Likert scale with m = 5 categories to the human papillomavirus (HPV) vaccine among mothers. By means of a sampling of 507 mothers, we analyze the level of intention performing a useful framework for data based on a discrete probabilistic model which takes into account both the discrete nature of the observed realizations and the composite nature of the score elicitation mechanism. Conclusion and interpretation are discussed.
Testing, Psychometrics, Methodology in Applied Psychology, 2018, Vol. 25, pp. 429-446, DOI: 10.4473/TPM25.3.7