MDX - Get the last 3 members of the selected member

Question

I am pretty new with MDX so please bear with me.

I am designing an analytical chart with PerformancePoint in which the bottom(X) axis will display a date range. The displayed date range will depend on the selected value of the date filter, which is based on the DATE dimension with this hierarchy: Year>Quarter>Month.

Let's say the user selects 2010 from the date filter. We want the query to return the last 4 years prior to the 2010 (2007,2008,2009,2010). If Q1-10 is selected, we want the last 4 quarters including Q1-10. If a month is selected (Sept 2010), we want the last 4 months (June 2010, July 2010, Aug 2010, Sept 2010).

I appreciate any kind of help.

Answer 1

Use the LastPeriods function:

LastPeriods(4, <<UniqueName>>)