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Writing a formula

Open a calculation box in the influence diagram to write its formula. Boxes with arrows into it appear as inputs you can insert with one click. Using a variable draws its arrow, and dropping it removes the arrow. Formulas can only use a short approved list of arithmetic and helper functions. This keeps the model safe to edit, including by an AI assistant.

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Distribution function library

Instead of a range, an estimate can be defined by a function from the distribution function library, for example when you know the shape of an uncertainty from your data.

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Model code

Analyst tools → Advanced: model code shows every formula as the code the engine runs. Use it to review the whole model in one place.

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Combining formulas with options

Options can carry settings that change a formula’s result, so the same structure compares different choices. Properties marked in model feed the calculation.
If a formula gets long, split it into several calculation boxes. Smaller boxes are easier to check and show up separately in the results.