Rolling 12 Mths In Script or Expression?

[dmac1971]

I have data running back around 4 or 5 years.  I want to show the rolling 12 month totals for a measure for the last 15 months.  I have a pretty standard Calendar Script, and can get this working to a point, however the aggregation is correct for the most recent month but then wrong by increasing measure for each month backwards.

I'm trying to replicate the table below from Excel, again suspect will have to use a pivot table, hence cant use Accumulation to my knowledge?

[Anonymous]

rangesum(before(total sum(yourmeasure)),0,12)

[MK_QSL]

Calculating rolling n-period totals, averages or other aggregations

[dmac1971]

Have skimmed through a number of posts including what you linked and haven't found what I'm looking for.  Robin that expression is not returing correct result.

[Anonymous]

so please post a small inline example or a sample excel input file...

[MK_QSL]

If you only provide screenshot, you might not get answer ever after long time.
Provide proper sample data and your expected output.

We will try to help you out on this.

[dmac1971]

Yes accept that, however its not always possible to share data.  Will mock something up to see if I can get across what I am trying to achieve, thanks for your help so far.

[MK_QSL]

Yes I also accept that its not always possible to share data. But it's always possible to create dummy data accordingly to our applications and share here.

[Anonymous]

no example --> no solution