To reduce the project risk, ensure the accuracy of investment decisions, from the perspective of economic decision-making and through an analysis of project investment decision potential risks, this paper build a set of fuzzy comprehensive evaluation models. For the project investment risk certainty fuzziness, this paper uses probabilistic model to various risks totality judge accurately realized the data from a static to a dynamic of change, the various difficult problems encountered within the economic range thinking by way of a mathematical model for to provide a scientific basis for investment decisions.
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