ContentsTwo class rules side by side
Two class rules side by side
Both maps draw the same values from one request, with quantiles on the left and equal interval on the right, so any difference between them is the class rule. The cameras are tied together, so the tract under your cursor is the same tract on both sides.
Median household income, two class rules
2,324 tracts in New York City, the same values on both sides.
Locked
Layout
Two scales, because the panels differ in classification. The same colour does not mean the same value on both sides, so read each legend against its own panel.
| Setting | Quantiles | Equal interval |
|---|---|---|
| Classification· scales differ | Quantiles | Equal interval |
ACS 2023 5-year · boundary vintage 2020 · both panels are the same request, so any difference on screen is the class rule and not the data
- Shows
- One representational decision, isolated, with everything else held still.
- Hides
- Whether either map is a good answer. Two panels make the difference legible and say nothing about which rule suits the question, and a pair locked to one camera still hides whatever lies outside the shared frame.
Change the city, level, measures and class rules
City
Level
Measure, both panels
Classification, left panel
Classification, right panel
Unlocking the measure is deliberately available and deliberately a mistake. It gives two panels whose colours answer different questions, and the figure then declines to draw one legend over them and says, in the table under the maps, which settings make a colour mean two things. A comparison tool that allows the misleading comparison without comment teaches nothing about why it misleads.