---
metadata:
- name: generator
content: Diplodoc Platform v5.50.6
alternate:
- https://yandex.com/support/direct/en/visit-lift/about.md
- https://yandex.com/support/direct/ru/visit-lift/about.md
- https://yandex.com/support/direct/tr/visit-lift/about.md
- https://yandex.com/support/direct/zh/visit-lift/about.md
---
> **Documentation Index:** Fetch the complete configuration index at https://yandex.com/support/direct/en/llms.txt
# How a Visit Lift survey is performed
The survey analyzes sessions of your target audience on your site. To do this, the ad campaign's actual audience is evaluated.
From the campaign's target audience, a test group (90%) and a control group (10%) are selected. The test group consists of users who have seen the ad. The control group is made up of users in the same audience who are intentionally not exposed to the ad. A control group is created through a [virtual auction](https://yandex.com/support/direct/en/research.md#virtual-auction).
The survey results are calculated using the formula:
#### Have questions? {#questions}
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Our customer support can only assist you with campaigns linked to the username you are contacting us from. You can check your username by opening [ya.ru](http://ya.ru/) in another browser tab. Our team can access your data only when processing your request.
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Scan the QR code or tap it to follow the link.
If you select Telegram or WhatsApp, keep in mind that Yandex does not control and is not liable for how third-party messengers store your data and chat history.
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You can contact us from 10:00 to 19:00 (UTC+3) by phone:
**Moscow**: [+7 495 139-91-93](tel:+74951399193)
**Russia**: [8 (800) 700-47-45](tel:88007004745) (toll-free within Russia)
To access campaigns, the customer service specialist will need your [PIN](https://yandex.com/support/direct/en/troubleshooting/pin-code.md).
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{% cut "Leave a message" %}
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