Fig. 1: Educational trajectories of the 1976–1988 birth cohort.

The figure presents a comprehensive Sankey diagram generated using gvisSankey, which visualizes the educational pathways of the 1976–1988 birth cohort. The diagram validates the educational sequence data and highlights the dynamic and heterogeneous nature of educational progression, capturing the complex interplay of sequential dynamism, branching heterogeneity, and pronounced selectivity in shaping the cohort's educational trajectories.