How Hacker News ranking algorithm works

Re:How Hacker News ranking algorithm works by amix on Monday October 11, 2010 @05:23PM (#1781335)

The current HN algorithm probably follows the same basic idea, but the implementation is more complex because of spammers.

I did a fast test of how placements would look like with the vanilla HN algorithm using the current frontpage: http://paste.plurk.com/show/316811/

The code to generate the new sorting: http://paste.plurk.com/show/316812/

As you can see the rankings are not the same, but very similar...

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Re:How Hacker News ranking algorithm works by jacquesm on Monday October 11, 2010 @05:40PM (#1781403)

Flags are the main factor that you've missed I'm not quite sure how to measure them reliably but from what I've seen in terms of 'jumps' downward on a heavily flagged post it looked like 6 flags will take you off the homepage on to page two when you have about 20 upvotes. Maybe that will allow you to model it.

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Re:How Hacker News ranking algorithm works by chegra on Monday October 11, 2010 @06:35PM (#1781573)

I have two will take you off when you are under 9 upvotes.

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Re:How Hacker News ranking algorithm works by J3L2404 on Monday October 11, 2010 @06:09PM (#1781482)

How did you know how many flags it had?

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Re:How Hacker News ranking algorithm works by jacquesm on Monday October 11, 2010 @07:24PM (#1781697)

Counting the jumps down the home page. Would be nice if PG could confirm this either way (right or wrong), but I'm fairly sure that's what it is. It wouldn't make sense any other way (it was this post: http://news.ycombinator.com/item?id=1759548 ) it got to the first spot on the homepage very quickly and then dropped in six steps off the homepage.

19 points, six steps, that's averaging 3 points per step, so it's like a single flag counts for 3 'downvotes' on an article or something close to that.

That's all guesswork of course.

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