What the value (not set) means
At a glance
(not set) is a placeholder name that Analytics uses when it hasn't received any information for the dimension you have selected.
You might see (not set) as the value for dimensions in the Advertising, Behavior, Users dimension groups in your reports.
An in depth look
The cause for (not set) to appear as a dimension value is specific to each report. For details on why you see (not set), and ways you might be able to correct this, see the individual report sections below.
The Advertising reports
If (not set) is appearing in your AdWords reports, it means that the website or app you're tracking in the Analytics account is receiving traffic from an AdWords account that is not linked to the reporting view. You should review the following:
- Auto-tagging is on but cost data is not applied (See: Missing Data in AdWords Reports)
- There is a redirect in the URL
gclidparameter is altered or dropped from the ad (See: CPC Data Not Collected)
- Auto and manual tagging are being used at the same time
- Manually tagged URLs are missing a parameter
Occasionally, information related to a click can be lost even if auto-tagging is enabled. As a result, you may see some (not set) entries instead of keyword, ad-content, or campaign information that could not be collected.
Matched Search Query
If (not set) is appearing in your AdWords > Matched Search Query reports, it is likely that everything in the AdWords section is (not set) as outlined in the above section. However, if the regular AdWords reports (Campaigns & Keywords) are reporting data correctly, then there are several additional reasons why (not set) could appear in the Matched Search Query report:
- Google Display Network traffic (this traffic does not have an associated query, so will show as (not set))
- Manually tagged campaigns (this report only works for auto-tagged traffic)
- Invalid clicks will show up as (not set)
- In the AdWords search-terms report, all terms classified as "(other search terms)" will be reported as (not set).
The Behavior reports
Site Content > Landing Pages
If you see landing page = (not set), this is generally due to a session with no page or screen view level hits included.
It’s possible to have a session that doesn’t include a page or a screen view, but does include another kind of interaction hit type, like an Events or Ecommerce hit type. To see a few examples of sessions with different kinds of hit type, refer to the article about the difference between Entrances and Sessions.
To identify which hit type is causing the issue, use the advanced filter (found at the top of the data table) to restrict the data to include page/screen views matching exactly 0 in the following reports: Behavior > Events, Acquisition > Social > Plugins, and Conversions > Ecommerce reports.
In most cases, the cause is either a view filter that removes specific page/screen views, or the omission of page view tracking on web pages or the omission of screen view tracking on Android or iOS apps.
The Audience reports
Technology > Browser & OS > Screen Resolution
It is quite common that the screen resolution that has the highest Ecommerce conversion rate is (not set). Additionally, a high incidence of (not set) Ecommerce rates can occur for these dimensions:
- Flash Version (occurs if Flash is disabled in web browser settings)
- Screen Colors
- Language (in demographics report)
Generally, these traffic segments are small, and so are not statistically significant.
When you select a traffic-source related dimension (such as Campaign) in a Custom Report, the dimension is applied to all sessions in the account, not just paid search (often referred to as CPC) traffic. Therefore, sessions that do not have any campaign information associated (e.g., direct, referral traffic) will be reported under (not set). You will see something similar if you select the Campaigns report under Acquisition rather than the Campaigns report under Acquisition > AdWords.
Instead of creating a Custom Report, the best way to get this information would be to use an advanced segment in the specific report.
Similar to the custom reports, when you select a dimension like Campaign in the Visitor Flow, you may see (not set) in the Funnel path because all sessions from direct and referral traffic would not have campaign information. If you do the math, you'll see that (all other campaigns sources) + (not set) = total sessions.