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It's not 1-1 with either comment or submission upvotes. It's more complicated than that, largely for anti-abuse reasons.

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I have noticed that a single downvote sometimes counts for -2 rather than -1. Sometimes I'll undo a downvote because I think a comment wasn't bad enough to cost 2 points. I have been trying to spot the pattern behind it for over a year with no luck. Can you explain this or is it secret?

Hah well my two downvotes here and two corresponding lost points say otherwise. But I'll take your word for it.

In a weaker gravity field with a low sample frequency the algorithm does indeed appear 1:1. The complexity arises once a peripheral second gravity field can no longer be ignored or a certain noise threshold is passed.

The equation ends up looking something like this: https://slack-files.com/TEGQB8GNS-F01UU5FMKRR-820b186081

Once you start thinking about it in terms of the definite integrals of a piecewise function you'll see where the weights would be applied in more extreme situations.

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