Can someone please explain how I acheive the following...
I have a two dimensional line chart{month offset, start month). I'm trying to track customer churn rate by month, so how long a customer stays before cancelling. All start months, start with a 0 month offset and each subsequent month I add one to the offset. Please see attached image.
I'd like to change the structure of the chart so I calculate the accumulated percentage drop each month for each start month rather than show the number. Ie, month_offset 0 = 0%, month_offset 1 = 5%, month_offset 2 = 8%, month_offset 3 =12%, etc.
