Compare A Time Window Against The Immediately Preceding Time Window Of The Same Size.

Hi Astroraf. 

I talked with AssafHanina and he provided this:

"The issue here is having 2 periods such as last 2 months.
The offset should be last 0-1 compare to 2-3 but it's compare 0-1 to 1-2 PastPeriod function has been deprecated (although still in use) but will end up with the same output. Filtered measure can provide the flexibility with 2 date filters and provide wider option for the user to compare between different time periods rather than Fixed time periods."

Does that help?