The quality index of a site is an indicator of how useful your website is for users from the point of view of Yandex.
X is calculated for sites that participate in Yandex search results. The value of the index is regularly updated.

When calculating the quality index takes into account the audience size of the website, user satisfaction, the level of trust to the website by the user and Yandex, as well as other criteria.
The calculation is based on the data of Yandex services.
If the site has mirror, other mirror site will be equal to the amount of main.
Figure X is a subdomain of the site, as a rule, equal to the amount of the primary domain.

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