Asymptotically Min—Max Bias Robust M -Estimates of Scale for Positive Random Variables
正值随机变量尺度的渐近极小极大偏差稳健 M 估计AI 解读 ↓
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Asymptotically min—max bias robust M-estimates of scale are obtained for positive random variables with ε-contaminated distributions, using any one of a broad class of loss functions of positive and negative bias. Any such estimate is a scaled order statistic, with the order statistic and scaling constant determined by ε, the nominal distribution, and the loss function. Some calculations for specific cases show that for a large range of ε the min—max order statistic solution has a breakdown point near .5 and is well approximated by a scaled median. Some calculations and Monte Carlo results indicate that the asymptotic result has considerable finite sample-size relevance by virtue of the squared bias being at least as large as the variance for rather modest sample sizes (depending on ε) and by virtue of attractive mean squared error performance in the presence of even rather small fractions of contamination.