On the robustness of the standard estimates of the exponential mean to contamination
指数分布均值标准估计量对污染的稳健性AI 解读 ↓
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反馈分类问题指数分布均值标准估计量对污染的稳健性AI 解读 ↓
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The performances of the standard estimators of the mean of an exponential distribution are evaluated when this basic distribution is contaminated by another of the same type. Surprisingly, perhaps, it is found that the sample mean is asymptotically fully efficient for the mean of a mixture. For small samples, on the other hand, a comparison of the two standard statistics with the appropriate optimal linear statistics in terms of the mean squared error and bias shows that for relatively coarse mixtures there is a lot of room for improvement. With this in mind, other usable linear estimators are proposed and shown to be almost always preferable to the standard exponential statistics for the population mean. The emphasis is mainly on long-tailed contamination, but the behaviour of the two standard statistics and the new statistics in short-tailed mixtures is also discussed.