If you would like to know the source of a variable, you can review the metadata information by hovering over the three-dot icon by each variable.
Use this menu to view metadata, or Add to Favorites.
Viewing a variable's metadata will provide you with the name, definition (if available), Year, Vendor & Data Set.
If the metadata doesn't answer your question, and you still need more information, feel free to contact our support team at: support@simplyanalytics.com