Exploring the Associations Between Personality and Response Speed Trajectories in Low-Stakes Intelligence Tests

In this paper, published in Personality and Individual Differences, using log-normal Item-Response Theory models for response time data, we study how personality traits predict response speed trajectories in low-stakes reasoning tasks. We found that some traits are associated with increasing in speed vs. decreasing in speed, controlling for item effects.

Accounting for Variable Task Discrimination in Divergent Thinking Fluency Measurement – An Example of the Benefits of a 2-Parameter Poisson Counts Model and its Bifactor Extension Over the Rasch Poisson Counts Model

In this paper, published in Journal of Creative Behavior, we introduce new psychometric models for count/fluency tasks (tasks in which individuals have to provide many instances). Notably, we extent the Rasch Poisson Counts Model (RPCM) to account for variable discrimination (2-Parameter Poisson Counts Model) and to account for local dependencies/nuisance factors (Bifactor 2-Parameter Poisson Counts Model).