You can export your data from the Yet xAPI LRS in two ways. You can scroll to the bottom of your LRS view and at the top of the Activity Stream data card in the top right corner you'll find an icon to "Download CSV." The .CSV file will be formatted as it was in the Activity Stream view in the Yet xAPI LRS. This file can now be manipulated in Excel or uploaded for processing in other BI tools.
You can also customize your data export using the data fields in the Activity Stream. Learn more about customizing your .CSV Export in the "Data Card: Activity Log" article.