STEM help / Data dialogs

Transformation / Cumulative Sum

A Cumulative Sum transformation may be selected from the Type menu in the Input and Transformation dialog. A Cumulative Sum transformation requires an aggregate input and it calculates the cumulative sum of the input up to the current period. The output of a Delta transformation is classified as instantaneous.

Cumulative Sum (Delta (y)) = y + c.

These inputs are accessed via the Input and Transformation dialog.

Output Unit

Select the output unit that you want to use from the drop-down list box, or define your own. The selection has no effect on the model but is used in results graphs.

Default: none.

Features See Multiplier Transformation, Transformations.

Multiplier (2)

Multiplies the Input of a Transformation to calculate its Output.

Default: Constant {1.0}.

Features See Multiplier Transformation, Transformations.

Cumulative SUm

Input

Identifies an element as a source of demand for a Transformation; together with a Basis, which specifies the particular result, associated with that element, which defines the size of that Input in any year. Expression Transformations have several inputs, called Input 1, Input 2, and so on.

Default: Resource (<none>, Installed Capacity). For an Erlang B Formula transformation, Service (<none>, Busy Hour Traffic). For a Time Factor transformation, Transformation (<none>).

Features See Transformations.

 

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