This is spectacular, Ozzie! Thanks for your work, and thanks even more for sharing the source.
Josh Horowitz

Great questions.

  • For normal distributions, [a,b] indicates the 90% confidence interval. For uniform distributions, it represents the 100% range.
  • The ± indicates the average 45% range, which would end up with a 90% range. Basically, most of what people enter and see are the 90% confidence intervals. I felt like this would more intuitive to non-statisticians than the 68% interval (1 std deviation). Of course, it could definitely use better documentation to make that obvious. You can validate this by expanding the metric (double clicking it or clicking the ‘expand button’ in the top right), and seeing the lowest 5th and highest 95th percentiles, which should roughly match the ± number.
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