TY  - RPRT
        AU  - Gimenez-Nadal, José Ignacio
AU  - Molina, José Alberto
AU  - Velilla, Jorge
        TI  - Who Shirks at Work? An Application of Machine Learning to Time Use Data
        PY  - 2026/Mar/
        PB  - Institute of Labor Economics (IZA)
        CY  - Bonn
        T2  - IZA Discussion Paper
        IS  - 18432
        UR  - https://www.iza.org/index.php/publications/dp18432
        AB  - Worker productivity depends not only on hours worked, but also on how work time is actually used, and time-use evidence shows that non-work at work is non-trivial. This paper provides a data-driven characterization of shirking, and studies which observable characteristics best predict shirking behavior using American Time Use Survey data over 2003–2024. We implement a machine-learning forward selection procedure based on out-of-sample predictive performance. Our results suggest that shirking strongly depends on stochastic or unobserved factors, and that the determinants of the extensive and intensive margins are different. Moreover, the most informative predictors are predominantly job-related and time-allocation variables, whereas macro and labor-market indicators seem less relevant. This suggests that policies or managerial approaches to improve worker efficiency relying on observables face important limitations.
        KW  - shirking
KW  - non-work at work
KW  - ATUS data
KW  - prediction
        ER  -