Estimates are more reliable the closer a site is to being ranked #1.
The "Sites Linking In" count shows the number of sites that Alexa found that link to this site.
Search Traffic The percentage of traffic, both free and paid, that come to this site from a search engine over the past 3 months, updated daily.
The change number shows the difference versus the previous 3 month period.
We identify these patterns by looking at the activity of millions of web users throughout the world, and using data normalization to correct for any biases.
The more traffic a site gets, the more data we have to calculate estimated metrics.