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Very nice!

It's also interesting that it differs from this search[1] performed in HN's own search system.

[1] [pdf] with filtering on Past Year -> 4,422 hits.

https://hn.algolia.com/?query=%5Bpdf%5D&sort=byPopularity&pr...

Yea.. there would be more total hits for PDFs found on page 2 or page 3... which I didn't analyze. 500 I think is good enough. Enough reading already ;)

Sure, although the positions of the items in the answer sets at cutoff = 10 differ as well.

meaning the ranking? Algolia is probably using a different score algorithm. If I were designing it I would probably also factor in number of comments but I think it's fair to use number of upvotes.

I'm assuming that too. Just an observation. Very interesting work of you nonetheless!

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