Estimation from Quantiles in Destructive Testing
破坏性测试中利用分位数估计参数AI 解读 ↓
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破坏性测试中利用分位数估计参数AI 解读 ↓
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SUMMARY The estimation of mean and standard deviation from the values of two quantiles dividing the specimens into three groups has, by previous authors, been made the basis of a quality control system of gauging specimens at two levels. When a specimen may be gauged once only, single gauging, different specimens must be gauged at each level, and the efficiency of the method is reduced. For a variate normally distributed with mean, μ, and standard deviation, σ, the efficiency of estimation by single gauging of a quantity μ + ασ is calculated, and contour maps drawn to show the variation of this efficiency with the gauge levels, expressed as normal deviate values, for α → 0, α = – 1, α = – 2, α = – 3 and α → – ∞. Maximum efficiency is attained when the gauge levels are set symmetrically about the mean. Contour maps calculated for a strongly asymmetric case of the gamma distribution show the maximum efficiency of estimation of μ to be 20·6 per cent, and of σ to be 20·0 per cent, while the positioning of the gauge levels for maximum efficiency is now rather critical and the optimum levels are no longer symmetrical about the mean.
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