How does Alexa calculate rank?

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Tags

1. #total
2. #pageviews
3. #alexa
4. #determined
5. #visit
6. #updated
7. #given
8. #measure
9. #daily
10. #ranking
11. #traffic
12. #unique
13. #based
14. #requests
15. #users
16. #number
17. #visitors
18. #ranks
19. #combined