Integrates values in a dataset, which can be either structured or primitive.
If the dimensionality of the dataset is greater than 1, the dataset is treated as if it is a series of 1D strips having a length the same as the first dimension of the dataset.
Use BINSUM after FREQUENCY to produce a cumulative frequency distribution. The REVERSE keyword permits data to be summed back to front - ie. from high "X" to low "X".