STEM help / Data dialogs

Time Series / Exponential Growth

If you choose to enter a time series as an Exponential Growth, you must specify a Base value and a Multiplier parameter, representing an annual growth (or decay). This type of time series is commonly used to specify tariffs.

Base

The value of the time series in the Base Period.

Default: 0.0.

Multiplier (1)

An amount which multiplies the previous year’s value in each year. A value of 1.05 represents 5% annual growth, while a value of 0.95 represents a 5% decline. The Multiplier parameter must be positive, and no greater than 2.

For a Floor, the Multiplier indicates how fast the curve converges to the specified Floor. A lower value will create a steep decline towards the Floor in the early years.

Default: 1.0.

Base Period

Specifies a particular period when the Base value should apply. This can be a year, a quarter, a month, or even a fully-qualified date.

Default: Y0.

Options

Alignment

Determines what point in the Base Period or Period the Base value or corresponding values is/are associated with.

Default: End for demand-related inputs, but Beginning for tariffs and cost trends.

Step (1)

Constrains the dynamics of any time-series input to yield a constant value for quarterly, annual or even indefinite periods.

Default: Day (no constraint is applied: values evolve smoothly).

 

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