Tracking an advertising company, returning people from an advertising company

Question

Google Analytics

I am running an advertising company, there is a need to find out how many people return after the first visit to the site for each advertising company.
In general, there are several thousand clicks per day, but the effect on the result of sales is rather small and I want to know how many users come back.
From the tool, you can probably use popular counters: Google Analytics, Yandex Metrica, Live Internet and others.

Answer 1

from sophisticated ways:
1) you can add a cookie to the user and when he returns it is considered and you can fix the fact of the return. there are a number of errors (disabled cookies, the user comes from different browsers, etc.)
2) You can analyze the server logs, when switching from advertising, we fix it in the Ipshniki database, then we run it through the server logs and determine whether the person came again.
from the usual ones: we set up a slice on the liveinternet, it's quite simple, then we monitor the number of open pages and returns.

Answer 2

In Google Analytics, this is all right out of the box, each visit has an attribute that records the new user who made this visit or is returning. There are even pre-installed segments with which you can watch the behavior of these groups of visitors separately.
And soon GA will have multitouch analysis, that is, a sequence of entry sources for one visitor will be shown. Now it is somewhat difficult to do this, because if a person re-enters not by direct entry, but through a search or a link, then the source of the visit is overwritten.