Comparison of Filtered Start of Week / Month vs Previous filtered Start of week /filtered month

[ShanShami]

Hello All,
I am working on a data set where I need to show Ticket Value variance as below...
Ticket Value = Revenue / Passenger

Visual 1
1. Filtered Start of Week vs previous week of Filtered Start of Week

Visual 2
1. Filtered Month vs previous month of Filtered Month

How can I create a measure for such scenarios.

Regards,

 

[ShanShami]

for example if I select 21Jan24 from Start of Week slicer then I wan to calculate the variance between 21JAn24 and 14Jan24.