Here is post-intro. I just want this part to be snippet
Q: How has the mean center of Starbucks stores in Gangnam, Seoul changed over the years?
Before you begin this tutorial, do the following first:
Running the Spatial Analyzer
[1] Click the Processing menu at the top, then click Toolbox.
The Processing Toolbox panel will appear on the right side of the window.
If the Spatial Analyzer plugin is not installed, refer to "Installing Urban Analyzer".
[2] In the Processing Toolbox, expand the SpatialAnalyzer submenu and double-click Mean Center Tracker.

[3] In the “Mean Center Tracker” window, set Start Field to open_year, then click Run.
[4] Execution Result: