Creating a scoring algorithm for voting app

Question

I have just created what I thought to be a good scoring algorithm until I looked at some demo results. It now looks pretty floored though

I have a table with a number of images I have another table with any number votes on all of the image that have been submitted.

Now rather than just increment a vote counter to output the score, I though I'd do something else so came up with this.

  TIME NOW - IMAGE SUBMITTED TIME
( ------------------------------- ) x 1000000 = Score
    TOTAL VOTES FOR THIS IMAGE

But the score seems very floored with the images that were recently submitted.

Example

Recent image: 13 votes, submitted 8528 seconds ago: Scores 1514

Older image: 222 votes, submitted 1948015 seconds ago: Scores 110

Is there a better way for me to do this that evens it all out?

Sylvain Biehler · Accepted Answer · 2014-09-03 09:36:18Z

0

You might want to use an exponential:

Score = (votes from today) + 0.99*(score from yesterday)

answered Sep 3, 2014 at 9:36

Sylvain Biehler

4782 silver badges9 bronze badges

$\begingroup$ So continuing that for each day that has passed since the submission data? Score = (today) + (0.99 x (today-1) ) + (0.96 x (today-1) ) + ( 0.93 x (today-3) ) $\endgroup$
– Shane Jones
Sep 3, 2014 at 13:15
$\begingroup$ you have many ways to compute an exponential. I think you should update it once a day, so you can use it very fast on every request $\endgroup$
– Sylvain Biehler
Sep 4, 2014 at 14:12

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