U12.02
Area bias in choropleth maps
Cards in this group · 5
- U12.02.1A choropleth draws the eye to whichever region is biggest on the map, regardless of its value
- U12.02.2Coloring a map by raw count mostly draws a population map, not the pattern it claims to show
- U12.02.3Slicing the same values by equal interval, quantile, or natural breaks produces three different-looking maps
- U12.02.4Three color classes show only the roughest pattern; seven start revealing the finer structure
- U12.02.5Resizing regions by their data value fixes a choropleth's area bias but makes the map hard to recognize