To summarize, PageRank measures the value of a web page based on the quantity and quality of links. The higher the PR of a publication, the greater the benefit a domain will receive when it gets a backlink . It is not difficult to imagine that in the past SEOs were very attached to this metric – based on an algorithmic scale – which could also be used as a purchase and sale of incoming links.
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In the past, there was only the green bar on the Google Toolbar malaysian business email list that gave indications regarding the presence of a value ranging from 0 to 10. Behind this indication, however, lies a refined calculation.
How does Google work in this case? It goes from considering the simple number of links received to the value that the single link has, so as not to flatten all the backlinks on the same level. The calculation of PageRank is expressed by a formula published in the already linked official document.
The PR of page A is given by the value of all pages that go from T1 to Tn in relation to the parameter d. That is, it is a damping factor set at 0.85. In short, without going too much into the details of the algorithmic formula of PageRank, we can say that this metric does not simply evaluate the quantity of links by normalizing the number of links on a page.
pagerank dampening
Rather, it values web pages by evaluating the aforementioned damping. That is, the PageRank is only partially transmitted from page A to all those that receive links. This process of link juice – the flow of PageRank through websites – is depicted in the image from polemicdigital.com .