Article text:
Sep. 24, 2009
Excerpt:
The formula I found that matches up best to the movement of the Tii App in the rankings is:
(D1+D1+D1+D1+D2+D2+D2+D3+D3+D4+D5+D6+D7)/13
With D1 being the number of sales in the past 24 hours, D2 being the number of sales from 25 to 48 hours ago and so on.
