title: redrawn
emoji: 🗺️
colorFrom: blue
colorTo: gray
sdk: static
pinned: false
license: mit
short_description: Redraw the district lines and the answer changes
redrawn
Does the map change the answer? 1.9 million New York City crashes, one question — do neighbourhoods where speeding is cited more often have more injurious crashes? — and a different answer from every map of the city.
Between individual crashes the correlation is +0.055. Across census tracts it is +0.262, across police precincts +0.469, across community districts +0.551, across boroughs +0.709. Contiguous equal-size districts drawn deliberately span +0.07 to +0.83. Not one crash record changes; only the boundaries move.
This page re-runs the analysis in your browser. It holds the per-tract crash counts and the tract adjacency graph and recomputes the zone rates and the correlation on every interaction, so nothing you see is a stored answer — and the "draw a new map" button really does build a fresh contiguous partition of 2,310 census tracts.
Data: NYPD Motor Vehicle Collisions and Department of City Planning boundaries, via NYC Open Data.
Method, controls and the full write-up: https://github.com/UsmarHaider/redrawn