There are several tools that offer interactive comparisons between websites. It’s quite amusing playing with such tools. I did it with websitegrader and got results like these for some statistics websites … and for blogstats:
In general I think these comparisons give a first hint and are just interesting but should never be used or understood as scientific explanations. Deeper investigations are needed.
A test with Statistics France shows only very small differences in a second report. The tool seems to be coherent in itself.
Some explanations about the measured categories (partially from Websitegrader):
“A website grade of 97/100 means that of the hundreds of thousands of websites that have previously been evaluated, Websitegrader’s algorithm has calculated that this site scores higher than 97% of them in terms of its marketing effectiveness. The algorithm uses a proprietary blend of over 50 different variables, including search engine data, website structure, approximate traffic, site performance, and others.” – From Websitegrader. Not very transparent!
“Google PageRank relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page’s value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. But, Google looks at more than the sheer volume of votes, or links a page receives; it also analyzes the page that casts the vote. Votes cast by pages that are themselves important weigh more heavily and help to make other pages important.” – From Google
Traffic rank by Alexa . Alexa is an online service measuring millions of sites on the Internet and comparing them.
Inbound links: One of the most important measures for a website is how many other sites link to it. The more links the better.
Google inexed pages: This number is the approximate number of pages that have been stored in the Google index. The Google web crawler will visit the website periodically and look for new content for its index.