Tim Hayes is an Assistant Professor of Quantitative Psychology at Florida International University. His quantitative research primarily focuses on using statistical simulations to evaluate novel methods for addressing missing data in longitudinal research. Missing data are a ubiquitous problem in a variety of applied research settings. While researchers often have clear a priori hypotheses concerning key variables in their substantive models, they rarely have well-developed a priori hypotheses concerning the factors that might lead to missing data. As a result, many existing methods of assessing the relationship between predictor variables and missing data are used by researchers in an inherently exploratory manner.
A family of recent missing data methods takes advantage of this reality by using exploratory data mining techniques based on Classification and Regression Tree (CART) analysis to address missing data. Whereas many popular missing data techniques assume multivariate normality and linearity, CART and its extensions model complex nonlinearities and interactions among predictors without making the same parametric assumptions. One approach addresses missing data by using CART and random forests analyses for binary outcomes to model the probability of dropout and create inverse probability weights (Hayes & McArdle, 2017; McArdle, 2013) A second approach addresses missing data by using CART and random forest analyses for continuous and categorical outcomes to generate multiple imputations (Doove, Van Buuren, & Dusseldorp, 2014). Tim's main program of missing data research has focused on evaluating and comparing these CART-based missing data methods, with a particular focus on their performance in small sample research settings, such as randomized longitudinal clinical trials.
- Multiple Imputation; Missing Completely at Random; Imputation; Statistical Analysis
Scholarly & Creative Works
Other Scholarly Work
- Single and Combined Effects of Positive Behavior Support, Medication and Academic Accommodation for Children with ADHD awarded by Child Health and Human Development 2021 - 2026
- Engaging Male Caregivers in Effective Prevention Programming to Reduce Risk of Violence and Violence-Related Injury awarded by Disease Control and Prevention 2021 - 2024
- Individual Differences in the Development of Spatial Skills: Role of Hippocampal Function and Structure awarded by Child Health and Human Development 2019 - 2023
- Child spatial ability: What role do parents play? awarded by Child Health and Human Development 2021 - 2023
- Project Enhancing IEP Implementation of Children with ADHD Using Daily Report Cards: An Efficacy Trial (PASS) awarded by Institute of Education Sciences 2019 - 2022
- FIU Center for Reducing Health Disparities in Substance Abuse & HIV in South Florida awarded by Minority Health and Health Disparities 2018 - 2022
- Timothy Hayes
- https://orcid.org/0000-0001-7530-0241 (confirmed)