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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:

YearMarket Size
201710000
201810100
201910500

Output ROLLFORWARD('OriginalNode', 'Market')

YearMarket Size
201695
2017100
2018100+(10100/10000) = 101
2019101+(10500/10100) = 102,03


Rollforward with multiple driver nodes

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

Inflation in Percent:

YearInflation
201710%
201810%
201910%

Growth in Percent:

YearGrowth
201720%
201820%
201920%

Revenue in EUR:

YearRevenue
20171000

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

YearROLLFORWARD(...)
20181000 + (1000 * 0.1) + (1000 * 0.2) = 1300
20191300 + (1300 * 0.1) + (1300 * 0.2) = 1690

(lightbulb) 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.


See also: Simulate Future Values of your Data with Rollforward , Model One-Time Effects to Correct the Simulation Basis,  Creating a Model with periodic Loops

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