Status: fitting monotonic splines to t-digest cdf sketches.
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I assume a t-digest ends up being basically an equal-area (vs equal-width) histogram?
It's not even equal-area. There are upper bounds on cluster mass, but not any lower bound. A newly-added cluster may be quite small. Clusters move around as data land on them, so there is no particular regularity. That's how the sketch moves in response to data.
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