How alexa(or any other similar service) calculate website traffic rank and/or website statistics?
Notifying Google about domain redirection
Calculating pageRank in a searchEngine
Is there a `typical' Pagerank convergence threshold
Page rank using hadoop
PHP pagerank API not working in sept. 2012
Advantages Page Rank has over TF-IDF
Does Google give back its former PageRank to a page that returned 301 during some time
PHP Pagerank Class
Website to check page rank based on keyword [closed]
What's google's position on programmatically querying pagerank?
Regaining Google PageRank
Which PageRank formula should I use?
Google PageRank: Does it count per domain or per webpage