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With the cost estimation of military aircraft as the research object,this paper aims to study the contradiction between the choice of explanatory variables in index modeling and the maintaining of model validity.It analyzes and establishes a cost estimation modeling concept based on an Effectiveness Index and studies the way to construct Effectiveness Indexes for the sake of cost estimation modeling.Based on a case study,the paper establishes and analyzes the Effectiveness Index-based cost estimation models and DAPCA(Development And Procurement Costs of Aircraft)models developed by the RAND Corparation.The comparison of these models shows that the Effectiveness Index-based cost parameter models not only comprehensively consider the obvious driving parameter indexes of the cost,but reduces the variables of regressive analysis,hence giving the model a higher reliability.
With the cost estimation of military aircraft as the research object, this paper aims to study the contradiction between the choice of explanatory variables in index modeling and the maintaining of model validity. It analyzes and establishes a cost estimation modeling concept based on an Effectiveness Index and studies the way to construct Effectiveness Indexes for the sake of cost estimation modeling. Based on a case study, the paper establishes and analyzes the Effectiveness Index-based cost estimation models and DAPCA (Development And Procurement Costs of Aircraft) models developed by the RAND Corparation The comparison of these models shows that the Effectiveness Index-based cost parameter models only only comprehensively consider the obvious driving parameter indexes of the cost, but reduces the variables of regressive analysis, hence giving the model a higher reliability.