Catchment count concordance
StatMedAnalysis | 7 November 2026 | Use aggregate or hypothetical figures only.

Use only counts with a defined unit and period. Do not allocate medians or assume land-area shares are population shares.
1. List each source area once and record the target boundary vintage.
2. Record the basis of the fraction assigned to the target; compute assigned = source count × fraction, residual = source count − assigned.
3. Sum assigned counts and residuals without rounding intermediate values. Check that they reproduce the original total.

Source | Vintage | Count/unit | Fraction assigned | Basis/source | Assigned | Residual | Caveat
______ | _______ | __________ | _________________ | ____________ | ________ | ________ | ______
______ | _______ | __________ | _________________ | ____________ | ________ | ________ | ______
Original total: ____ Assigned: ____ Residual: ____ Reconciliation difference: ____
Evidence the allocation suits this particular variable: ____________________
Fictional example: A has 100 residents and share 0.8; B has 50 and share 1. Assigned counts 80 + 50 = 130; residual 20; source total 150. No event numerator was allocated: residential shares alone do not establish event shares.
Stop if fractions fall outside [0,1], sources overlap, or shares lack a defensible basis.