Twenty US states, population in millions. California and Texas pull the high tail — every classifier has to decide what to do with them.
US state population
Equal-interval · 5 bins · n = 20
EI · 5
Predict
What changes?
Before switching from equal-interval to quantile, predict: which regions will jump bins? Look at the histogram below — most regions cluster at the low end, so quantile spreads them out across more colors there.