There are many site exploring tools and services on the Internet, which provide all kinds of competitive data on every website or domain. We shouldn’t always accept their data as reliable and this is why:
Business attention concentrates on Alexa’s top-100K traffic sites, which are reviewed more carefully and the data about them is supposed to be precise and reliable.
However, even this isn’t true in every case. In a test we encourage everyone to repeat, our team analysed a site rating in the middle of Alexa Top-100, with a PR of 5, and a three-year domain history.