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I know how to get a calculated member that calculates difference between 2 periods -
"member . as '((., ..PrevMember) / (., ..CurrentMember))', FORMAT_STRING = "#,##0.00%"
The above would help me calculate the difference between Month 1 and Month 2, Week 1 and Week 2 etc.
However, I would like to create a calculated member that calculates a difference between Week 1 of Month 2 and Week 1 of Month 1.
Measure performance in month 1: (., ...)
The ParallelPeriod MDX function exists for just this case.