ssas - MDX - active in current period, and not active in previous period -

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What is the most effective way to do this in MDX? I know that you can create 2 calculated measures, which are active with the current period of the dimension of time, and the second with a previous period, and then a filter with a complex situation.

Though the work about others that can be more efficient? Any recommendations?

My goal is to create a set of calculated measures that will help client analysts. The main 2 dimensions are these [calendars], and obviously [the customer]. I have a fact that includes activity for customers, these are 3 institutions which will be based on our calculations.

This is from an article by Chris Web:

ways to optimize it With the follow-up of the article: 

  With the reminder of the member. [Returning customer] as COUNT (unnecessary (non-payment ([customer]. [Customer] [customer] .mmbrs, [measure] [internet sales amount]), {[measure]. [Internet sales amount]} * {NULL: [Date]. [Calendar]. PRERENTMEMBER.PREVMEMBER}) Member Remedy [New customer] AS [remedy] [Customer number] a ?? Remedy [returning customer] SELECT {[remedy]. [Customer number], measures [returning customer], measures [new customer]} at 0, [date]. [Calendar]. [calendar year].     from 1 on the first [adverses works]

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