Search for: [Abstract = "The Three Sigma rule was applied, correlations and determinants were determined, and the area of the cost curves was described with a third degree polynomial. The conducted research showed that\: 1. the optimal formula for determining the best\-fit curve, which allow to determine the cost and time of construction works, is a 3\-degree polynomial\; 2. cost curves, within a certain bounding box, determine the area of the most likely cash flow\; 3. when planning the course of a cost curve, it is advisable to use the bounding box of cost curves rather than a single, model, theoretical, or empirical mathematical expression describing the cost curve."]

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