Hello,
I would need to calculate 10 day prior variance column wise.

For Instance, if the column date is 5th October, I would need to calculate the variance for 10 days prior to next date in 'Date of Release' Column. ie Value for date 6th October - Value for 26th September and also % Variance. For dates in Column that don't have next date in 'Date of Release', we would need to take the last record to calculate the variance value.
Can someone please help me on how to calculate variance & &Variance?
Thanks.