progression_ratios() computes progression ratios from
historical grade-level enrollment, with mean, geometric, median, last,
and weighted summaries. It warns about calendar-year gaps across the
complete supplied history before n_years selects the most
recent transitions.progression_matrix() places ratios on the sub-diagonal
of a square projection matrix, leaving the entry-grade row at zero.project_enrollment() advances a base enrollment vector
over an arbitrary horizon, from either ratios or a prebuilt schedule,
overwriting the exogenous entry grade each year. Missing schedule
coefficients are preserved with an aggregate warning rather than
imputed.swing_schedule() builds per-year schedules that hold
enrollment flat during swing years, apply recovery multipliers, then
resume normal projection.
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