How Yandex indexes sites
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What is TIC?

A Citation Index (CI) is a scientific means of quantifying the “importance” of a scholar's research or work. The number of links to a piece of work from other sources determines the index value of that work. However, to determine the importance of a piece of research as accurately as possible, the quality of these links should be considered along with the quantity. Academic publications, newspapers and entertainment magazines may all link to a particular piece of research. The relative weight of links on these sources varies.

Our Thematic Citation Index (TIC) determines the “credibility” of internet resources based on a qualitative assessment of links to other sites. The greater the quality the more “weight” the link is said to have. This indicator is calculated by a specially developed algorithm. The similarity in content between the source and the site to which it links, plays an important part in this equation. The number of links to a specific site also influences the TIC value, but the TIC is not ultimately defined by the quantity of links, but the total of their weights.

As a means of determining the credibility of various internet resources, we employ this method to calculate how accurately sites are categorized in Yandex.Catalog. The TIC is not purely a quantitative indicator, so we use a number of rounded figures, which help us evaluate the “importance” (“credibility”) of resources in each area (category).

The concept behind the Thematic Citation Index is quite simple. As a general rule, people who create websites pay close attention to the content both of their own website and the sites to which they link (as they are effectively recommending this content to their visitors). Our TIC takes into account links to other sites and assigns each link a "weight" (a value) depending on the credibility of the linking site.

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