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Penalized Estimation and Forecasting of Multiple Subject Intensive Longitudinal Data

Zachary F. Fisher, Younghoon Kim, Barbara L. Fredrickson and Vladas Pipiras
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Zachary F. Fisher: The Pennsylvania State University
Younghoon Kim: University of North Carolina at Chapel Hill
Barbara L. Fredrickson: University of North Carolina at Chapel Hill
Vladas Pipiras: University of North Carolina at Chapel Hill

Psychometrika, 2022, vol. 87, issue 2, No 3, 29 pages

Abstract: Abstract Intensive longitudinal data (ILD) is an increasingly common data type in the social and behavioral sciences. Despite the many benefits these data provide, little work has been dedicated to realize the potential such data hold for forecasting dynamic processes at the individual level. To address this gap in the literature, we present the multi-VAR framework, a novel methodological approach allowing for penalized estimation of ILD collected from multiple individuals. Importantly, our approach estimates models for all individuals simultaneously and is capable of adaptively adjusting to the amount of heterogeneity present across individual dynamic processes. To accomplish this, we propose a novel proximal gradient descent algorithm for solving the multi-VAR problem and prove the consistency of the recovered transition matrices. We evaluate the forecasting performance of our method in comparison with a number of benchmark methods and provide an illustrative example involving the day-to-day emotional experiences of 16 individuals over an 11-week period.

Keywords: ILD; forecasting; time series; regularization; LASSO; proximal gradient descent; vector autoregression (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11336-021-09825-7

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