CUMULATIVE SUM creates a LIST with values that are the cumulative sum of all preceding values of an input list.

For example, if you use CUMULATIVE SUM with an input List: x of size N the resulting CUMULATIVE SUM has values:

• x1, x1 + x2, x1 + x2 + x3, … , x1 + x2 + x3 + … + xN-1 + xN