Methodology and trust
Show the seams.
Source universes, suppression, intervals, reconciliation, and rights decisions stay explicit.
| Year | State source | FARS | Difference |
|---|---|---|---|
| 2015 | 1,102 | 1,102 | 0 |
| 2016 | 1,088 | 1,088 | 0 |
| 2017 | 1,083 | 1,083 | 0 |
| 2018 | 1,103 | 1,103 | 0 |
| 2019 | 990 | 990 | 0 |
| 2020 | 1,060 | 1,060 | 0 |
| 2021 | 1,153 | 1,153 | 0 |
| 2022 | 1,092 | 1,092 | 0 |
| 2023 | 1,131 | 1,133 | −2 |
| 2024 | 1,060 | 1,060 | 0 |
The 2023 −2 difference is retained as a source-reconciliation signal, not treated as an error or smoothed away.
Universe decompositions
Crash location describes where a crash was recorded. Residence describes where a decedent lived. FARS uses its national fatal-crash census. These are related, non-interchangeable universes.
Suppression and absence
CDC WONDER suppresses small counts. Other cells may be absent for rights, freshness, or evidence-floor reasons. Public redactions do not reveal the internal reason or permit subtraction attacks.
Uncertainty
Intervals use the metric’s registered method. Band wording is hedged when its interval crosses an assigned threshold.
Source inventory and notices
acs
- Source: U.S. Census Bureau, 2024 American Community Survey 5-year estimates.
- This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
crss
- Source: National Highway Traffic Safety Administration, Crash Report Sampling System; national estimates only.
- Weighted national estimate; not a county or state value
fars
- Source: National Highway Traffic Safety Administration, Fatality Analysis Reporting System (Final files).
- Final-release and source-universe notice
fmcsa
- Source: Federal Motor Carrier Safety Administration, MCMIS Crash File, U.S. DOT Data Portal.
- Matured years and deduplicated crash-event notice
odot
- Source: Ohio Department of Transportation, TIMS Crash Locations.
- Aggregate-only use; no source-record redistribution
penndot
- Source: Pennsylvania Department of Transportation, public crash open-data files.
- Aggregate-only use; no source-record redistribution
vm2
- Source: Federal Highway Administration, Highway Statistics, Table VM-2.
- State-grain and edition notice
wonder
- Source: CDC/NCHS, National Vital Statistics System, Underlying Cause of Death on CDC WONDER.
- Retain the query edition and CDC WONDER data-use conditions
- CountyCase CC BY does not convey or replace WONDER obligations; downstream users remain independently bound