Comparable-occupancy structure-fire patterns

The standing annual full files provide reporting geography and geocoded records plus incident type, property use, origin, heat source, first item ignited, ignition cause and factors, human factors, fire spread, and reported casualty fields. Those documented dimensions support descriptive pattern analysis among reported structure-fire incidents by defined area, occupancy cohort, period, and PDR vintage. Participation, incident reporting, and field completeness vary, and NFIRS supplies no exposure denominator, so outputs must not be described as complete incidence, total population counts, or exposure-normalized rates.