For a simple view -- just one Mark with Measure Names / Values -- i'd like to setup:
1) a TopN Filter (for the x2 number of recent dates);
2) a FIXED LOD expression using MEDIAN() aggregation (to split into two Date Bins);
3) a number of Measures (as Quick Table Calculations --> Difference along Date Bins)
4) a LAST()==0 Table Calculation Filter (to show only the recent Date Bin Mark).
Please find the attached.
Hope it could help a bit.
TEST_v10.5_YF.twbx 922.7 KB
This worked and simplified my original approach. I just need to reframe the title of the visual so that the user understands how the parameter works and what data they are viewing (e.g., if you select 4, you are comparing the most recent 2 records against the previous 2 records for a TOTAL of 4 records).
If I have any questions or further advancements to this analysis I will post for your knowledge.
James, you're welcome.