The bureau computes what nobody has counted — and publishes every study on the site where the data lives, with the full methodology and the dataset attached. If you write about it, take the numbers. They're CC-BY: reuse with a link.
All 348 combinations of the 1933 Dictionary of Color Combinations, computed: hue distribution, most-used colors, mood frequency. — on colorcombinations.org
The same 348 plates joined with the WCAG 2.x standard: AA/AAA pass rates, the most and least legible plates of 1933. — on colorcombinations.org