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The objective of this study is to describe the prevalence, frequency, and longitudinal development of regulatory offenses within Dutch inland shipping on both the ship and business level. We examine whether latent groups with differing trajectories can be distinguished and compare differences between these trajectory groups. Using longitudinal inland shipping inspection data from several inspection agencies Lorenz curves and Gini coefficients are used to describe offense distributions. Group-Based Trajectory Modelling is used to analyze longitudinal development of regulatory violations of ships and corporations. Between-group comparisons are made using (multivariate) analysis of variance. Results show a skewed distribution of offending on both the ship and business level. On both levels of analysis, four trajectory groups are found. Although differences in characteristics between trajectory groups were present, effect sizes were found to be small. We conclude that disproportionality in corporate offending is in constant motion. Regulators need to regularly (re)identify their target groups.