4 ms·

Ask HN: How do Ask HN rankings work?

30 points by d--b 10y ago

I've submitted a Ask HN today, which tanked in rankings within minutes. After 30 minutes it got off the ask hn front page and after 3 hours it went off all ask hn pages despite having scored 3 points. I still see some ask hn post on the front page with 2 points after 15 hours... I am not complaining (just a little bit, but what comes into play? karma? number of comments?

BayesStreet 10y ago
Score = (P-1) / (T+2)^G where, P = points of an item (and -1 is to negate submitters vote) T = time since submission (in hours) G = Gravity, defaults to 1.8 in news.arc Edit: obsolete algorithm, find updated below. From https://medium.com/hacking-and-gonzo/how-hacker-news-ranking-algorithm-works-1d9b0cf2c08d#.etm5srfyo https://medium.com/hacking-and-gonzo/how-hacker-news-ranking...
- alimw 10y ago
  If it needs more than one point to rank at all, how does a new submission come in?
  - grzm 10y ago
    New submissions start with a single upvote, just as comments do.
bsvalley 10y ago
It's much more complex... PG posted an updated version once. (= gravity* 1.8 timebase* 120 front-threshold* 1 nourl-factor* .4 lightweight-factor* .17 gag-factor* .1) (def frontpage-rank (s (o scorefn realscore) (o gravity gravity*)) (* (/ (let base (- (scorefn s) 1) (if (> base 0) (expt base .8) base)) (expt (/ (+ (item-age s) timebase*) 60) gravity)) (if (no (in s!type 'story 'poll)) .8 (blank s!url) nourl-factor* (mem 'bury s!keys) .001
- John23832 10y ago
  That's cool. Are they really using Clojure/Lisp?
  - lispm 10y ago
    The language is called Arc and runs on top of Scheme. The function mentioned above is here: https://github.com/wting/hackernews/blob/master/news.arc https://github.com/wting/hackernews/blob/master/news.arc
    - John23832 10y ago
      The more you know. Thanks.
- d--b 10y ago
  oow ok... thanks!
deleted 10y ago
[deleted]
arisAlexis 10y ago
sounds like the fate of all my submissions