The basic Friedman model is extended to allow for bias in cost estimates and the use of management judgement on market trends. The estimated mean bid is used as a parameter. Simulation, using data from four construction companies, is used to evaluate the performance of the resulting model. A sensitivity analysis is used to determine the required accuracy for the management estimate. A brief account is given of the introduction of the model as a practical tool of top management in a major construction firm.
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Grinyer et al. (1973) studied this question.
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