Toolset Q.) Re. Linkscape - How is the External Links (link juice) calculated in the API?
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Re. External Links (link-juice) - I really need to know what this reflects.Ie. linkdiagnosis.com divides the PR by external link factors to get an idea of link juice or power - how does Moz calculate this scoring?
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For external links a straight division of of PR by links per page isn't the best correlation to Google's ranking and PR system. Things like link location on page, number of links to the same site, anchor links, link text, nearby text, and more all play a part in calculating how much link juice to pass. The short answer, they don't exactly say. The long answer can be found on the pages referenced below, but you still won't get an exact number. The take away is that SEOmoz is constantly working to correlate their Linkscape produced data and rankings to Google's data and rankings.
References:
http://www.seomoz.org/blog/determining-whether-a-page-site-passes-link-juice
http://www.seomoz.org/blog/pagerank-sculpting-parsing-the-value-and-potential-benefits-of-sculpting-pr-with-nofollow
http://apiwiki.seomoz.org/w/page/13991139/Juice-Passing
http://www.seomoz.org/blog/early-ranking-factors-data-an-april-linkscape-update
http://www.seomoz.org/blog/linkscapes-august-update-better-domain-authority-numbers-new-partners-and-more
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