I only ask this because I seem to have stumbled on to this in my experience. Over the last two years my team has launched 3 solid new sites all in differerent sectors. There is virtually nothing connecting these sites at all. Even the people and the cities they were from was different.
We forecast our moves (business) with the sites based on the size of the audience so we hire auditors to forecast for us. So we are constantly analyzing the data. I have no idea how, but the sites have a relatively similar growth rate until they plateau. Each niche has a relatively different plateau level, but the growth rate is similar. The relative graphs are hard to tell apart, if you couldn't see the range. It seems like there is a 15 month growth rate until they plateau.
We are now trying to compare the link velocity, content size, and many additional factors, but I found it very interesting.
Has anyone else come across something you could perceive as fixed growth rate from new site to two years out?