For example, the base effect can ... Without a basis for comparison, data points won't be able to provide meaningful insight. A basis point always needs to be selected.

See the example provided by Microsoft below: How This Can Help. The comparison features help analyze data. You can use them to assess the success of your marketing campaigns, spot seasonal trends ...

To compare group data: Comparison is managed by filters (for example, Date or Search type). Either edit an existing filter or click New to add a new filter.