Importance of page rank
Importance of page rank, In this case, we have primary evidence of the importance of this factor. He tells us the same Google, which defines PageRank as:
«PageRank is based on the exclusive democratic nature of the web and uses its extensive structure of links as an indicator of the value of a single page. Google interprets a link from page A to page B as a vote from page A through page B.»
But Google check other things apart from the number of votes or links that a page receives, since it also analyzes the page that issues the vote. The votes cast by pages that are themselves «Important» weigh more and help turn other pages also «important».
The PageRank therefore takes into account the criteria analyzed above – the number of links incoming – but also takes into account the quality of those links.
The PageRank concept emanates from the same founders of Google. The idea was revolutionary at the time and we can think that it is still the hard core of the algorithm’s DNA Google.
It must also be taken into account that the number from 0 to 10 of PageRank reflected in the Google bar meter is not arithmetic, but exponential or logarithmic.
The founders of Google explain the PageRank in detail in their document published in 1998. There they say that «one can think of a link as an academic appointment.
Therefore, one page Important as http://www.yahoo.com/ will have tens of thousands of inbound links (or appointments) that point to it «(The PageRank Citation Ranking: Bringing Order to the Web, (Sergei Brin and Larry Page, 1998).
We will not expose here the very complex mathematical operations that allow us to calculate the PageRank of a page. They are explained by Amy Langville and Carl D.
Meyer, in their aforementioned work, «PageRank and beyond, the science of search engine rankings» (2006), but it will suffice to indicate that depends on:
-the number of inbound links to that page.
-the quality of those incoming links (the PageRank of the pages they link).
-the number of other outbound links to other pages in the pages they link. If the page that links has many outbound links, «the strength» of that link is less.
To better understand what it is, we have thought about comparing the link system with an irrigation system. The PageRank would be the total amount of water that reaches a field – web page– determined at a given moment, through multiple pipes -links.
If he water that receives by a pipe comes from a marsh with numerous pipes towards others fields, obviously less water arrives.
The quality of the water will depend on the quality of the
swamps. A website, composed of numerous web pages, also has an internal system of «irrigation» and redistribution of PageRank -water.
Each page created is a small tributary, and The more pages you have, the more water will reach the main page of the website. That explains why news websites have a high PageRank.
We can also think of a system of references and academic credits. How many more receive an author – a web page – better, but it will tell who gives the reference – it is not the same an eminence that another person much less reputed- and will also count-or at least should tell-the ease with which an expert gives good references about the work of others -in other words, if you cite thousands of authors or just a few.
Everything indicates that the PageRank of a web page influences its positions in the results.
Hypothesis 4 (H4): The vast majority (+ 90%) of the first results of different keywords will be pages that have a minimum of PageRank of 3.