The data samples on which various RAND aircraft airframe cost models have been based include all types of military fixed-wing aircraft — fighters, bombers, trainers, etc. It has long been held by many cost analysts that better estimates for one type of aircraft could be obtained if the sample were restricted to that type. An exercise is described in which the estimates of fighter aircraft are shown to be essentially the same whether the model is based on fighters only or a more heterogeneous group of aircraft.
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