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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.These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.