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Hi Marc, Did the blog post answer your question for you, or are you still looking for a way to segment the traffic?

The Caffeine udate was claimed to make instant updates to the Index. To me this suggests that as soon as the link is indexed it gives value. However, part of Google's patent suggests evaluation of links over time, so the history of a link could add value to that link. So like fine wine, links with age are worth more.So the value you are looking for may not be achieved until the link itself as aged and increased in value. What you suggest is that in your findings the value of a link is not immediate for ranking. I believe that is heavily dependant on the difficulty of the desired ranking. I have seen a link or two provide imediate value on obscure rankings. Where as, competitive rankings need the added value of time and quantity. Take an average for 10 5-star reviews. Not competitive. Easy to move the average by a few more reviews. Now consider average from 100 reviews. Much harder to move average. Take 10000 reviews and a new review is a drop in a bucket. Very competitive rankings will not see immediate value. Disclaimer, I am a pest control guy.