I don't know if my selection is static or dynamic. How can I tell?
Click Analysis > Click View Selections
Search for your selection
The Selection Type column will show if the selection is static or dynamic
A selection can be either static or dynamic. A static selection is a fixed set of IDs that does not change. For example, if a record that originally met the criteria of the query on which the selection is based changes so that it does not currently meet the criteria, the record ID is still included in the selection each time you use it. The selection contains the same records until you refresh it manually or with an automated process. A dynamic selection analyzes membership each time it is used in a function, so records may be added or removed from it each time you use it.