Can % Change Be Computed Using a Beastmode?
[see attached image]
Suppose I have this two column dataset: one column has the date and one has a quantity.
What I need is to take a quanitity, subtract the quantity corresponding to the month before, and then divide that difference by the quantity corresponding to the month before. This is the (newold/old) way to compute % change.
Can this be accomplished in a Beastmode or ETL? It is my understanding that beastmodes are calculations can only evaluate that which is in the same row. Could I use a case to solve this?
Comments

It sounds like you should be able to accomplish this in the ETL with a rank and window function (https://knowledge.domo.com/Prepare/Magic_Transforms/ETL_DataFlows/03ETL_Actions%3A_Rank_and_Window)
You should be able to apply an "offset" to get the previous month's value on the same row as the current month value, from there you can either do the math in the ETL or now that its on the same row you could do it in a beast mode.
Cheers,
JeanPaul
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