Can someone please guide me. I have each SKU and would like to get total count and standard deviation. I can get sum but for 7months of data how can I get total count and standard dev?
Break the standard deviation equation into its parts and solve them bit by bit:
Standard Deviation = Square Root of ( ( each X minus average X) / number of values ).
I prefer to break complex line item formulas into components ... each () is typically a separate line item and they get pulled together into a single simpler formula.
Average X = (sum of X / number of values)
Number of Values = sum of (If In relevant time range? then 1 else 0)
In relevant time range? = boolean time filter
Here is another thread that shows a more elegant way to achieve this in a single line item: