Every number below comes from the same … New York City crashes. Nothing is added, removed or reweighted. The only thing that changes is where the boundaries are drawn — and the correlation an analyst would report moves from near zero to almost one.
Shaded by each zone's injury rate. Hover a zone for its numbers.
One dot per zone, sized by crash count.
Each tick is one map you have drawn. Keep pressing — the answer wanders.
Crashes: NYPD Motor Vehicle Collisions, …, via NYC Open Data. Boundaries: NYC Department of City Planning. Correlations are recomputed in your browser from the same per-tract counts the analysis uses — see maup.js.