Algorithms for assessing the authority of a site

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Yandex TIC (thematic citation index) and Google PageRank were the official indicators of authority and link links, they could be checked in the corresponding search engine. Now they are not used, but for the story it is necessary to know about them.

Yandex TIC

TIC (thematic citation index) — calculated fishing and forestry email list taking into account the subject matter and the number of links to the site. The coincidence of the topic of the link and the site is an important condition for increasing TIC. This is how authority within the subject matter was calculated. (Initially, Yandex simply operated with CI, an analogue of PageRank)

When counting links, resources where anyone can leave a link are not taken into account: forums, boards, unmoderated directories, blogs and other resources where there is no control over the placement of links. This was in the official Yandex help.

It was envisaged to reset the TIC for identified manipulations.

Yandex IKS (site quality index) has replaced TIC, but it is already weakly connected with links, its value depends more on the real popularity and traffic of the site. According to Yandex, it expresses the demand for the site. It is no longer realistic to cheat it, it will grow along with your site and business.


Google PageRank

PageRank is a value that characterizes the importance of a web page. Only the fact of a link is evaluated. The more incoming links, the more important the page. Moreover, more “important” pages, which receive many links, also convey much more weight. PageRank is calculated for a specific page, not the entire domain.

Obviously, classic PageRank is easier to inflate than TIC, because thematic connections are not taken into account.

PageRank was patented by Google in 2001, and officially disabled and reset to zero for all sites in 2016. It will show zero when checked, but in 2017, search spokesman Gary Illyes said on Twitter that it was still one of the internal signals Google relies on.

There are different modifications of the algorithm that take into account other factors when calculating PageRank to protect against spam. For example, Topic-sensitive PageRank, which takes into account the topic of the page on which the link is located.


TrustRank

The essence of the TrustRank algorithm is that first, sites with a high level of trust are manually selected: experts, universities, large portals. Then, taking into account the links between pages, you can calculate the level of trust for any site: the further the number of links from an authoritative resource, the less authority.

It turns out that with TrustRank, trust flows through links between sites. The further from obviously high-quality resources, the less authority.

The algorithm also works the other way around, sites have AntiTrust: the closer your site is to spam sites, the lower its authority. Thus, by purchasing links on low-quality sites, you are doing yourself a disservice.

Reverse PageRank can be used to calculate spam sites. The strongest spam will be determined from sites that link to many other pages, which link to many other pages, and so on.