STEM help / Calculation framework

Inputs beginning with ‘I’

Include

A choice governing cross-references from the audit reports for other elements, which also allows you to suppress the direct audit output without losing the selection of results.

See 4.25 Auditing the calculation of results at run time.

Default: Yes.

Include Year Zero

A choice governing the inclusion of a base or reference period immediately preceding the Model Start Date which allows you to capture initial conditions.

Default: Yes.

Increment

The amount by which a Straight Line time series increases each year or, more generally, each Increment Period. A negative Increment indicates a decreasing quantity.

Default: 0.0.

Increment Period

Defines a reference period for the Increment input (which is interpreted as increment per increment period, such as the change per month or per annum). This indicates how the Increment input should then be scaled in proportion to the length of the current period for calculation.

Default: Year.

Independence Weighting

The proportion of the Cost Independent Tariff which contributes to the total tariff.

Composite tariffs are calculated as the weighted average of the cost-independent and cost-dependent tariffs, according to the Independence Weighting.

Default: Constant {1.0}. Tariffs are cost independent.

Initial Cash Deposits

The amount of surplus cash on deposit as liquid, short-term investments at the start of the model run.

Default: 0.0.

Initial Cost Dependent Tariff

The Cost Dependent Tariff for a Service in the first year when there is demand for that Service. In subsequent years, the Cost Dependent Tariff is calculated from the previous year’s feedback cost and the Charge Multiplier.

The feedback cost is the proportion of costs allocated to a Service, earmarked for a particular tariff. This initial tariff is required because no costs will be allocated to a Service before it has demand. It may be necessary to run the model in order to match the initial value to subsequent calculated values.

Default: 0.0.

Initial Creditors

The amount of money that a Service owes its creditors at the start of the model run.

Default: 0.0.

Initial Current Account

The amount of cash in the current account at the start of the model run. A negative value represents an initial overdraft.

Default: 0.0.

Initial Debtors

The amount of money that a Service is owed by its customers at the start of the model run.

Default: 0.0.

Initial Dividends Payable

The amount of dividends outstanding at the start of the model run, which will be paid in the first year of the model run. In subsequent years, Dividends Payable is calculated from the Net Profit, Dividend Rate and Current Year Dividend Proportion.

Default: 0.0.

Initial Input

Defines an initial, pre-run value for the input of a Previous or Delta transformation. This directly controls the output of a Previous transformation in Y0 (or Y1, if Y0 is not included). The output of a Delta transformation in Y0 is the actual value of its Input in Y0 minus the Initial Input value (or Y1, if Y0 is not included).

Default: 0.0.

Initial Investments (Min.)

The amount of surplus cash in long-term investments at the start of the model run.

Note: In order to reconcile the year-zero initial values for the balance sheet with the assets calculated from the pre-run installation of Resources, the model may use a higher value for one of Initial Investments and Initial Long-Term Borrowing inputs than was entered in the Editor. If the calculated assets are too high, Initial Long-Term Borrowing will be increased by the required amount, whereas if the calculated assets are too low, Initial Investments will be increased by the deficit.

Default: 0.0.

Initial Long-Term Borrowing (Min.)

The level of funding raised by long-term borrowing at the start of the model run.

Note: In order to reconcile the year-zero initial values for the balance sheet with the assets calculated from the pre-run installation of Resources, the model may use a higher value for one of Initial Investments and Initial Long-Term Borrowing inputs than was entered in the Editor. If the calculated assets are too high, Initial Long-Term Borrowing will be increased by the required amount; whilst if the calculated assets are too low, Initial Investments will be increased by the deficit.

Default: 0.0.

Initial Retained Earnings

The amount of cumulative retained profit to date at the start of the model run.

Default: 0.0.

Initial Share Capital

The book value of paid-up share capital for the network at the start of the model run.

Default: 0.0.

Initial Tax Payable

The amount of tax owing at the start of the model run, which will be paid in the first year of the model run. In subsequent years, Tax Payable is calculated from the Pre-Tax Profit, Tax Rate and Current Year Tax Proportion.

Default: 0.0.

Input

Identifies an element as a source of demand for a Transformation; together with a Basis, which specifies the particular result, associated with that element, which defines the size of that Input in any year. Expression Transformations have several inputs, called Input 1, Input 2, and so on.

Default: Resource (<none>, Installed Capacity). For an Erlang B Formula transformation, Service (<none>, Busy Hour Traffic). For a Time Factor transformation, Transformation (<none>).

Input 1, Input 2,

A set of proportions – one for each Input – which weight the allocation of costs through an Expression Transformation, according to the Basis input.

Default: 1.0. All Inputs receive an equal weighting.

Installation Profile

The relative proportions of the units of a resource which are installed in each year of its pre-run installation. For example, use an Interpolated Series to specify units per year, or an Exponential Growth for increasing demand. The Normalise Profile input governs whether the Installation Profile should be scaled to match the actual number of units required in the first period of the model run, or whether it stipulates specific numbers of units to be installed for each of the pre-run years up to and including the first period of the model run.

Default: Constant {1.0}. Equal numbers of units of each age are installed.

Note: pre-run installation needs to be enabled (Pre-Run Installation = Yes) within the Data/Other details dialog for this input to work. This input is disregarded if the global input Pre-Run Installation = No.

Interactive

A choice governing whether audit reports are shown on the screen for each period during the model run.

Yes: The audit will be ‘interactive’, with every report for each period/element/feature displayed in successive audit windows.

No: An audit log is generated directly without showing each separate report on the screen. Subsequent model runs will not be interrupted by the audit process: you will simply be prompted to review the audit log file when a run is complete.

See 4.25.3 Controlling the audit output.

Default: Yes.

Interest

The number of years’ grace before any interest is paid.

Default: 0.

Interest Rate

The interest rate of the loan. This can be defined as a fixed rate or, for variable-rate loans, as a time series.

Default: Constant {0.0}.

Investment Rate

The annual interest rate for surplus cash in long-term investments. This is the benefit received by the network from funds in long-term investments.

All rates are specified as proportions, e.g., an interest rate of 10% is specified as 0.1.

Default: 0.0.

 

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