Proxima from Yandex: what it is and how it works

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Proxima is a Yandex search quality metric.

Proxima as a Yandex algorithm checks:

whether the visitor will solve his problems on the site;
how users are loyal to the site;
what is the ratio of useful and advertising content;
what is the index of pairwise comparison with similar sites.

Thus, it is this metric that helps the user of the Yandex search engine to get the most relevant answer to the request.