Sitemeter is not perfect, but since most of us use it and it measures us in the same way, that’s my measure of choice. I ignore stats from blogs that do not allow independent verification of Sitemeter counts.

Google subscriber counts are also informative, but that’s just one small piece of blog traffic.

You have stumbled on the one biggest unknowns on the internet, how to accurately measure traffic. There is currently not one best solution to the problem, and you have done what many others have in gathering data from various meters and drawing a best estimate through the data points.

Services like Alexa and Compete rely on users to download a tool that forwards user data that is compiled to estimate traffic. This skews the data to sites that are visited by those who have opted in to the service. They also do not accurately measure traffic to subdomains on sites like blogger. Another relatively new service is IzeaRanks, which requires the site owner to embed code in their html to track visitors. This service skews the data to those sites whose owners are knowledgeable enough to edit their templates.

Google pagerank and Technorati use links to measure authority, and this has nothing to do with traffic.

Tools such as Sitemeter probably get closer to measuring real traffic, but once again, users have to install the widget to be included.

Then you have the problem of who is creating the traffic. If a blog has 10 or 20 contributors who visit the site once a day, then they are adding 300 to 600 visits to a site that technically should not be counted. Users of wordpress.com who remain logged in do not have their visits counted by wordpress stats.

If a blog has one contributor and they properly block their IP address from the stats on Sitemeter, then they are placing themselves at a disadvantage to site owners who include contributor visits in their stats.

If you find a solution to your problem, you could become a very rich person.