ROLLFORWARD

Basic Overview

Description

Rolls the values of OriginalNode forward with the influence of Node1 and other optional Nodes. The rollforward starts after the last value along the finest time level and is done for each shared dimension individually. If Node is not of type percent, the percentage-wise differences are calculated relative to the first value of the Node. Both nodes need to have the time dimension available. The dimensions of OriginalNode are retained and determine the dimensionality of the result. Node1 is rolled up according to its aggregation function to match the dimensions of OriginalNode.

The difference between this function and ROLLFORWARD_MUL is how they treat multiple influence nodes. ROLLFORWARD sums up the effects and then applies them to the OriginalNode. ROLLFORWARD_MUL multiplies up the effects and then applies them to the OriginalNode

New in Version 2.0: the first argument is now optional. The rollforward will work as if a "flat" growth was supplied.

See examples of usage at Basic Data Upload & Model Definition, Model One-Time Effects to Correct the Simulation Basis

Signature

Version 1.19 and before: ROLLFORWARD('OriginalNode', 'Node1' [, 'Node2', …])

Version 2.0 (End of Feb. 2018): ROLLFORWARD('OriginalNode' [, 'Node1', …])

Parameters

OriginalNode: Input node, specified using the node name in single quotes (e.g. 'Revenue')
Node1: Input node, specified using the node name in single quotes (e.g. 'Revenue')

Example

Rollforward with a Percentage Node as Input

OriginalNode =

Year	Revenue
2016	95
2017	100

Inflation (Unit:Percent) =

Year	Inflation in %
2017	0.02
2018	0.1
2019	0.2

Output ROLLFORWARD('OriginalNode', 'Inflation')

Year	Revenue
2016	95
2017	100
2018	110
2019	132

Rollforward with an absolute Node as Input

Market in EUR:

Year	Market Size
2017	10000
2018	10100
2019	10500

Output ROLLFORWARD('OriginalNode', 'Market')

Year	Market Size
2016	95
2017	100
2018	100+(10100/10000) = 101
2019	101+(10500/10100) = 102,03

Rollforward with multiple driver nodes

When working with multiple drivers, the effects are calculated and applied individually per timeframe (e.g. year).

Inflation in Percent:

Year	Inflation
2017	10%
2018	10%
2019	10%

Growth in Percent:

Year	Growth
2017	20%
2018	20%
2019	20%

Revenue in EUR:

Year	Revenue
2017	1000

ROLLFORWARD('Revenue','Inflation','Growth'):

Year	ROLLFORWARD(...)
2018	1000 + (1000 * 0.1) + (1000 * 0.2) = 1300
2019	1300 + (1300 * 0.1) + (1300 * 0.2) = 1690

See the Combined Growth Pattern if you prefer to have the effects "influence each other" in the respective time frame.

If 'Node 1' relates to a EUR node, it will lead to unexplainable results.