How to Know the Traffic of a Website
What is Alexa?
Alexa is a search engine that records visits to each site from its toolbar, which must be installed on the Internet browser. The statistics shown are updated every week.
Using Search Status, we know the position of a site on the Web by moving the mouse on the blue bar, it displays a numerical value that is the rank of the site on the Web. For more details, you go on the site of Alexa, click on “Traffic Ranking” at the top of the screen, you enter a domain name and click on “Get details.”
Alexa is also at the origin of archives.org that stores all websites over time, and it was bought by Amazon in 1999.
How to interpret the values given by Alexa?
Sandbox for directories in Alexa graphs
Search Status displays a blue bar, which represents the average position for the past three months. This is the rank and is given primarily on the Alexa panel .
The traffic rank is a geometric mean of the number of unique visitors and the number of page views.
Then the page width is occupied by a graph, whose peried may be defined (six months in the example below), which represents changes in position. The value in the y axis is the percentage of visits for a site on Internet. By giving multiple site names, we can compare the curves.
Three tables are then drawn up over three periods: the last day, last week, and the last three months (here we retrieve the value at top of the panel), with also changes as compared with the previous three months.
The last column (3 ms change) show the difference between the last three months and the three previous three months.
The first table shows the percentage of users of the Alexa toolbar who visited the site.
The following is the rank of the site on the Internet for its traffic.
The third table provides the number of pages viewed by visitors for the same periods.
Then are given the visitors by country as a percentage of the total number of visits, the rank in each country, and the distribution for subdomains if there is ones.
The limitations of the system
According to the search engine Alexa itself, values given are more relevant as the number of visitors is more important. In fact only the first 100000 sites have a graph displayed because it is estimated that the lower values are unreliable.
Moreover statistics come from the Alexa toolbar, which must be installed. The theme can influence. Certain categories of netsurfers use rather the Google toolbar and visit more often some sites whose position is undervalued.
Assessing traffic of a website
The traffic is a logarithmic function of the position. In fact to get closer to the top it is necessary that the traffic increases exponentially. To pass from the rank 400000 to the rank 200000, for example, one must not double the traffic, but triple it (this is an example, not an exact ratio).
In fact you need to properly assess the traffic statistics by comparing with a site of the same rank. Yet the comparison is valid only if both sites have a high rank. You can not use Alexa in connection with the acquisition of a site based on traffic, because it is very easy to manipulate those numbers, either by visiting the site frequently with the Alexa toolbar installed, or by using a script. You should rather ask the person who sold the site the statistics to evaluate it, and you should verify the origin of traffic.
New Algorithm
On 16 April 2008, Alexa has changed its algorithm, which was based on visits counted on the Sparky toolbar, to expand the statistical sources. That changed the general classification, without making it more exact, on the contrary.
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