I just checked my profile page and was wondering quite a bit that my approximate impact dropped from 97k to 55k. How is this possible if none of the posts have been deleted?

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That is indeed surprising behavior! I just learned about the formula in researching your question. Based on the algorithm at What happened to the other people? My Impact (people reached) just dropped, namely:

That's how we got to the current method, which counts views on the following:

Answers - Views of the parent question for answers that are:

  • Non-deleted AND
  • Score > 0 AND
  • Also meets one or more of the following criteria:
    • In the top 3 answers OR
    • Is the Accepted Answer OR
    • Score >= 5 OR
    • Has at least 20% of the total vote count

I think what happened was that this answer of yours to a highly-viewed question (41,499 views as of today) fell off the "top 3 answers" list when this other answer got an upvote from 1 to 2 on 2019-07-19, taking 3rd place for itself from what was previously a five-way tie for 3rd. That de-listing of your answer from a ~42k view question seems to account for your "missing" impact numbers.

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  • thanks for your answer. What is surprising me is that I think I gained my approximate impact rather through my 60 questions then my 15 answers. Also I do not think (but I would need to check this), that any of them is as highly viewed. So for me it rather looked like a change in the way it is calculated. (I think all my posts have < 10000 views). I also wonder about the fact, that the algorithm only explains calculations for answers and not for questions. – nath Jul 21 '19 at 17:37
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    Indeed, questions get a more direct calculation, from what I can see here -- simply the number of views on a non-deleted question. Answers get impact counts by virtue of being on a viewed question and meeting the above criteria. – Jeff Schaller Jul 21 '19 at 18:04

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