Shelley Blozis

Education

• Ph.D., Psychology, University of Minnesota
• M.A., Psychology, California State University, Fullerton
• B.A., Psychology, California State University, Fullerton

About

In addition to her academic appointment, Shelley Blozis is an affiliated faculty member in the Center for Mind and Brain. From 2016-2022 she served as the Senior Statistical Editor and Senior Associate Editor of Health Psychology and consulting editor for Psychological Methods. She served as an associate editor of the Dictionary of Statistics and Research Methods in Psychology for the American Psychological Association. She is currently Chair of the UC Davis Olive Center.

Research Focus

Professor Blozis carries out research on the extensions and applications of statistical methods for clustered, repeated measures and longitudinal data. In addition to methodological work, she has developed a program of research based on health and social psychology. This has generated a line of research in collaboration with colleagues working in areas such as adolescent health, well-being, chronic illness, well as health education and preventative medicine, health psychology, animal behavior and nursing.

Lab

Longitudinal and Missing Data Methods

Select publications

Blozis, S. A., & Botan, H. (2025). Two-part mixed-effects location scale models for daily health data. Nursing Research.

Blozis, S. A. (2024). First-interview response patterns of intensive longitudinal psychological and health data.  Journal of Health Psychology. https://doi.org/10.1177/13591053241235751

Nestler, S., & Blozis, S. A. (2024). A latent variable mixed-effects location scale model that also considers between-person differences in the autocorrelation. Statistics in Medicine.

Blozis, S. A., & Craft, M. (2024). Alternative residual covariance structures in mixed-effects models: Addressing intra- and inter-individual heterogeneity. Behavior Research Methods. https://doi.org/10.3758/s13428-023-02133-1

Blozis, S. A. (2024). Bayesian pattern-mixture models for drop out and intermittently missing data in longitudinal data analysis. Behavior Research Methods. https://doi.org/10.3758/s13428-023-02128-y

Blozis, S.A., & Lai, M.H.C. (2024). A two-stage approach to a latent variable mixed-effects location scale model, Quantitative Psychology Research, Springer, New York.

Blozis, S.A., & Villarreal, R. (2024). On the use of self-reports in marketing research: Insights about initial response biases from daily diary data. Journal of Marketing Analytics. doi: 10.1057/s41270-024-00347-6

Blozis, S. A. (2022). A latent variable mixed-effects location scale model for longitudinal data with an application to daily diary data. Psychometrika, 87, 1548–1570.

Blozis, S. A. (2022). Bayesian two-part multilevel model for longitudinal media use data. Journal of Marketing Analytics, 10, 311–328.

Blozis, S. A., & Harring, J. R. (2021). Fitting nonlinear mixed-effects models with alternative residual covariance structures. Sociological Methods & Research, 50(2), 531-566.

Blozis, S. A., McTernan, M., Harring, J., & Zheng, Q. (2020). Two-part mixed-effects location scale models. Behavior Research Methods, 52, 1836–1847.https://doi.org/10.3758/s13428-020-01359-7

Teaching

Professor Blozis teaches courses in multilevel modeling and methods for analyzing longitudinal data and handling missing data.

Awards

Professor Blozis has received a number of awards throughout her career. In 2004, she received Faculty Travel Awards from the University of California, Davis, and the University of North Carolina, Chapel Hill. In 1999, she won the Faculty Research Award from the University Research Institute at The University of Texas at Austin and a Travel Award from the Institute for Science Education in Kiel, Germany. She has also been awarded grants from the National Science Foundation, the National Institute of Child Health and Human Development, and the National Institutes of Health.