Unique Visitor Segment

Hi Bindu,

Since segment (and the sub containers) have scope (Hit, Visit or Visitor for AA  / Event, Session or Person in CJA), there is no real need to have the Unique Visitor metric... 

If you need to look at all data for a visitor that met a specific criteria then you can choose a visitor scoped segment. However, in many cases, you need to be careful, as a Visitor scoped segment may not be what you need... You may actually need the scope of a specific hit, or a specific sequence inside of a visit... then you would pair that smaller scoped segment with the Unique Visitor metric.

Let's look at some simple examples:

HIT [

    Page equals home

]

This will return all the hits where the page name is home... paired with the page views metric this will return the total Home Page Hits, paired with Unique Visitor this will tell you the number of Unique Visitors that visited the home page within your date range.

VISIT [

    Page equals home

]

This will return ALL hits from all visits that hit the home page at least once. When you pair this with Page Views, not only will you get the home page, you will get every other page contained in those visits... when paired with Unique Visitors, you should see the same number, as the inflated PVs wouldn't impact the number or users.

VISITOR [

    Page equals home

]

This will return ALL hits, from All Visitors that hit the home page within your date range, including from Visits that they didn't hit the home page at all. While the UVs won't be inflated as such, IF you were to break this down by Day or Month, etc depending on your range, you will see UVs and Page Views on dates that the user didn't even go to your home page... (i.e. I came to your site on Feb 1, Feb 7 and Feb 13... I only saw the home page on Feb 7, but I will show up as a UV on all three days because within the month of Feb, I saw the home page).

I am working on articles to explain how scope works, but you might benefit from the more advanced article that I already wrote (the goes into more detail about containers, but touches on the scope concepts):
https://experienceleague.adobe.com/en/perspectives/the-magic-behind-the-curtain-complex-segments