Entity segments are a more advanced use of segments, where the extraction of an entity enables cohort analysis.
Follow these steps to create an entity segment:
On the main navigation bar, click Data.
In the side navigation menu, click Segments.
In the Segments list, find the segment to clone, and click Clone.
To make our task simpler, we are first cloning the Delayed Departure segment that was created in Cloning Segments.
Edit the Add Segment modal window by changing its entries.
In the Entity Expression modal window, enter the following expression:
[airlineid]
In the Add Segment modal window, notice the new expression in the Entity to extract field.
Click Save.
The new segment definition appears in the Segments interface.
Note that the segment Delayed Airlines has an entry in the Entity column, airlineid.