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Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology

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Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology ( military-jet-engine-acquisition-technology-basics-and-cost-e )

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74 Military Jet Engine Acquisition Variable lnrd01m lnritf lnsfc lnfsth Number of Obser- vations 23 23 23 23 Mean 5.667 7.735 –0.516 9.007 Median 5.432 7.723 –0.400 8.983 Standard Deviation 0.923 0.076 0.281 0.863 Minimum 3.931 7.628 –1.079 7.567 Maximum 7.544 7.863 –0.198 10.545 RAND MR1596-6.2 Table 6.5 Development Cost Results for Simple Derivative Engines lnrd01m = –39.422 + 5.066 lnritf – 1.299 lnsfc + 0.582 lnfsth (4.45) (–3.90) (5.33) R-squared = 0.8332. Adjusted R-squared = 0.8068. Root mean square error (MSE) = 0.40575. lnrd01m = natural log of the development cost in 2001 $millions. lnritf = natural log of the rotor inlet temperature in degrees F. lnsfc = natural log of the specific fuel consumption (lb/hour/lb). lnfsth = natural log of full-scale test hours. 1 0 –1 45678 Fitted values Figure 6.2—Residual Plot Graph for Simple Derivative Engine Development Cost Residual

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