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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
Unfortunately, I'm not sure it's as simple as an equation - we use a machine-learning algorithm and I think the result just happens to be logarithmic. I know who knows the answer, though, so let me ask and see if it's something we're able to discuss.