As per Alexa "What is Traffic Rank?"

As per Alexa ( The Web Information Company ) "Alexa computes traffic rankings by analyzing the Web usage of millions of Alexa Toolbar users. The information is sorted, sifted, anonymized, counted, and computed, until, finally, we get the traffic rankings shown in the Alexa service."

"The traffic rank is based on three months of aggregated historical traffic data from millions of Alexa Toolbar users and is a combined measure of page views and users (reach).

As a first step, Alexa computes the reach and number of page views for all sites on the Web on a daily basis.

The main Alexa traffic rank is based on the geometric mean of these two quantities averaged over time (so that the rank of a site reflects both the number of users who visit that site as well as the number of pages on the site viewed by those users).

The three-month change is determined by comparing the site's current rank with its rank from three months ago.

For example, on July 1, the three-month change would show the difference between the rank based on traffic during the first quarter of the year and the rank based on traffic during the second quarter."


Source: Alexa The Web Information Company
http://www.alexa.com/site/help/traffic_learn_more

1 comment:

  1. Alexa.com is a subsidiary of Amazon.com. It is a website which provides information on traffic levels for websites. The Alexa rank is measured according to the amount of users who’ve visited a website with the Alexa toolbar installed. Alexa toolbar is an application developed by Alexa Internet. Its primary use is to measure website statistics. This toolbar collects as well as gives some valuable information. Once you install it, the Alexa toolbar monitors all your surfing and collects information about what domains you visit. They use this data to rank web sites. The traffic rank they assign to websites is based on 3 months of aggregated historical traffic data from millions of other users and is a combined measure of page views and users. Webmasters, advertisers and ad networks use your blog’s Alexa rank as a gauge to determine the worth of a link on your website. If you depend on link or site selling as a form of monetization you’ll definitely want to increase your Alexa rank, because it’ll increase your bargaining power when it comes to ad pricing.

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