How is the project rating calculated?

The rating of the project is calculated as follows:

$$Project Rating = \frac{\displaystyle\sum_{i=1}^n(Rating * Factor)}{\displaystyle\sum_{i=1}^n(Factor)}$$

Rank	Factor
Newbie	1
Jr. member	2
Member	3
Full member	5
Sr. member	8
Professional	13
Hero	21
Legendary	34
Immortal	55

Factor affects a project's rating. The higher the user rank, the more impact on the project's rating.