http://news.ycombinator.com/item?id=1781013 http://news.ycombinator.com/item?id=1781013 quoting from PG's comment on that post: (= gravity* 1.8 timebase* 120

http://news.ycombinator.com/item?id=1781013 http://news.ycombinator.com/item?id=1781013 quoting from PG's comment on that post: (= 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 (* (contro-factor s) (if (mem 'gag s!keys) gag-factor* (lightweight s) lightweight-factor* 1))))) ----- or simplifying a bit: 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