This View allows you to compare to periods to each other.
Found in the Marking Attribution Explorer.
Specify the date range to use as the basis for your comparison. This works best when you choose a specific date range or use a relative 'complete' range, such as 'is in the past 7 complete days'
This Dimension groups dates into periods, based on their relation to the range specified in the 'This Period' filter. We recommend that you filter this dimension for 'IS NOT NULL' for best results.
Possible values for this dimension are 'This Period', 'Previous Period' (the period immediately before 'This Period'), and 'Previous Year' (the same date range as 'This Period', but 1 year ago).
Value will be NULL for all dates outside of these 3 periods.