This allows you to model demand which depends on something which has happened in an earlier year, based on a single Input and an integer Lag input, which represents the number of years delay. The Output in year n,
zn, is calculated as:
where
x = Transformation Input
c = Lag input.
The optional Costs input is used to avoid circular cost-allocation, just as it is for the Previous transformation.
As an example, you might use a Time Lag Transformation to model the installation of a secondary maintenance-upgrade Resource, a few years after the installation of a primary Resource. Take the first Resource as the Transformation Input, on the Basis of
Incremental Units, specify the desired Lag, in years, and then define a Transformation Resource Requirement for the secondary Resource.