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Efficiencies of Rounded Optimal Approximate Designs for Small Samples

机译:小样本的圆形最佳近似设计的效率

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摘要

Optimal exact designs are notoriously hard to study and only a few of them are known for polynomial models. Using recently obtained optimal exact designs (Imhof, 1997), we show that the efficiency of the frequently used rounded optimal approximate designs can be sensitive if the sample size is small. For some criteria, the efficiency of the rounded optimal approximate design can vary by as much as 25% when the sample size is changed by one unit. The paper also discusses lower efficiency bounds and shows that they are sometimes the best possible bounds for the rounded optimal approximate designs.
机译:众所周知,最佳的精确设计很难研究,而对于多项式模型,只有很少的已知。使用最近获得的最优精确设计(Imhof,1997),我们表明,如果样本量较小,则常用的四舍五入的最优近似设计的效率可能很敏感。对于某些标准,当样本大小改变一个单位时,四舍五入的最佳近似设计的效率可能会发生多达25%的变化。本文还讨论了较低的效率界限,并表明它们有时是四舍五入的最佳近似设计的最佳可能界限。

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