Off-topic: I'm looking at turnout histograms and I'm having the hardest time making sense of it. Why is registered voter count on the y-axis instead of x-axis,

Off-topic: I'm looking at turnout histograms and I'm having the hardest time making sense of it. Why is registered voter count on the y-axis instead of x-axis, since that should be the independent variable? Then I realized/recalled that is what histograms do. They flip the plot between the two axis. The original, non-histogram, plot is really turnout (y-axis) vs registered-voters. But that would look very different (generally such plots are very noisy, with a running-average that mimics a horizontal line). Then, if you wish to know what's the distribution of registered-voters with respect to turnout, you take a histogram. edit: on second thought, the plot still doesn't make sense. The y-axis should be # of polling stations, not # of registered-voters. edit 2: This article [0] has a plot that confirms my suspicion (y-axis is supposed to be number/frequency of polling stations, not number of registered voters). [0] https://doi.org/10.1111/j.1740-9713.2018.01141.x https://doi.org/10.1111/j.1740-9713.2018.01141.x