Incorrect calculation for "Most species" on the project page

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Platform (Android, iOS, Website): Website

App version number, if a mobile app issue (shown under Settings or About):

Browser, if a website issue (Firefox, Chrome, etc) : Chrome

URLs (aka web addresses) of any relevant observations or pages:

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Description of problem (please provide a set of steps we can use to replicate the issue, and make as many as you need.):

If there are more than 500 observers in a project, then the “Most species” section displays the users with the most species among the first 500 users with the most observations, rather than the users who actually have the most species in this project.
As a result, if we open the data in the “Most species” section and sort them by the “Species” column, the data will differ from similar data opened on the “Observers” page of the project, since we will not see some users in the list. The reason is that these users do not have enough observations to enter the list, which is then sorted by the number of species.
Example. Let’s open the project:
https://www.inaturalist.org/projects/birds-of-russia-and-crimea-ptitsy-rossii-i-kryma

And let’s compare the data in the “Most Species” section, click at “View all”, sort by the “Species” column and compare it with the data on the “Observers” page of the project, also sorting by the “Species” column.


We see that the user with the most species in the project is not displayed in the “Most species” section because he has only 590 observations, and the “Most species” list contains only a sample of 500 users, the last of whom has 802 observations. Similarly, for other users, for example, the 15th place with 417 species, but only 706 observations, is also missing.

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this was previously noted in https://forum.inaturalist.org/t/user-with-many-species-is-excluded-from-stats-if-not-within-top-200-observers-in-traditional-project/42912/6 and https://forum.inaturalist.org/t/im-missing-from-the-global-leaderboard-observers-by-species/60401. staff have not commented specifically on this, but i believe the behavior is intentional (though it’s not great in my opinion).

it’s possible to get the correct list using other means: https://forum.inaturalist.org/t/cutoff-for-2023-top-500-exceeds-6-000-observations/47901/27.

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Yes, I’ve heard from people that it works like that so iNat system doesn’t need to process a lot of data.

Correct, this is not a bug.

Why is this not a bug? The user who has the maximum number of species in the project and who occupies the 1st place is not even displayed in the list ranked by the number of species. Obviously, this is interpreted as a bug.

I mean “bug” as defined for this forum category:

By “bug” we mean that something is not working the way it is intended to.

The way you currently see it working is intentional. I’m not saying it’s ideal or could not be improved, but it’s not an error.

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