In the STEM Editor, a time series appears as a button, which leads to a dialog where you can edit the parameters of a particular construction as a collection of inner fields. Each construction requires a different set of inputs, so the dialog for the inner fields has an additional menu which allows you to change from one construction to another.
Time-Series Type Menu
The following types of time-series inputs are available:
- Constant
- Straight Line
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Exponential Growth
- Multiplier
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S-Curve
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Dual S-Curve
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Interpolated Series
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Transformation, Market Segment or Location
- Time-Series Formulae.
These are considered in turn in sections 10.3.33.1 Constant to 10.3.33.9 Time-series formulae. The annual interpretation of these types is broadly the same if you run a model with shorter time periods. The subsequent sections then explain how these types are evaluated for sub-annual periods – see 10.3.33.10 Specifying inputs for shorter time periods, 10.3.33.11 Using alignment to relate periods and 10.3.33.12 Using steps to constrain time-series inputs.