I need to compare previous months sales numbers and show change (positive or negative) in chart for current year, can it be done using self service.
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In Self Service create a calculated measure using below formula as per your dataset. Follow this URL for step by step guide on how to create a calculated measure : creating custom attribute and measure
In this formula, I have taken retail sales data to calculate month on month sales:
[Sales Amount] – (LAG([Property].[Sale Amount], 1) OVER (ORDER BY [Booking Date month]), 0) / (LAG([Property].[Sale Amount], 1) OVER (ORDER BY [Booking Date month]), 0)