How Alexa rank is calculated?

Related questions

1. Is Alexa rank important for SEO?
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4. What does Alexa rank measure?
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Tags

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