-0.039 pearson_r verified

Correlation (Pearson r) between county-level mapped ALPR camera density per 100k and 2025 violent crime clearance rate, across 1346 counties with at least 50 violent offenses

as of 2026-08-17 · license: ODbL

Source

FBI Crime Data Explorer — Return A master file (offenses known and clearances by arrest, agency-level) + Law Enforcement Employees agency crosswalk
https://cde.ucr.cjis.gov/
retrieved 2026-08-17

Method

Pearson correlation of cameras_per_100k vs 100*vc25/va25 over rows with va25 >= 50

from: data/county-camera-clearance-join.json

Caveats

Underlying camera locations are volunteer-crowdsourced (DeFlock/OSM), not verified by any camera operator or government body -- likely incomplete, possibly outdated or inaccurate (see repo TERMS.md).
County aggregates cover only agencies with a resolved county FIPS that reported all 12 months of the year to the FBI (Return A master file); state/federal and multi-county agencies are excluded. Camera-dense counties skew urban with structurally different caseloads/clearance baselines regardless of camera presence, and a given year's clearances are not necessarily for offenses reported that year. Correlation, not causation.

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