Time related function for calculate rate like reddit

Question

As we know that reddit has its ranking algorithm as well as stackoverflow.

I want to development a ranking algorithm for audit content dynamic ranking. Users can audit the contents by digg/bury. The ranking algorithm is for making the oldest/fewest actions content be auditted first.

Any ideas?

Answer 1

Here are the classical formulas: http://www.seomoz.org/blog/reddit-stumbleupon-delicious-and-hacker-news-algorithms-exposed

Formula:

(p - 1) / (t + 2)^1.5

Description:

Votes divided by age factor

p = votes (points) from users.
t = time since submission in hours.

p is subtracted by 1 to negate submitters vote.
age factor is (time since submission in hours plus two) to the power of 1.5.