The nonzero gain coefficients of Sobol's sequences are always powers of two
The nonzero gain coefficients of Sobol's sequences are always powers of two
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Sobol 序列的非零增益系数始终是 2 的幂
DOI:
10.1016/j.jco.2022.101700
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发表时间:
2021
期刊:
影响因子:
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通讯作者:
A. Owen
中科院分区:
文献类型:
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作者:
Z. Pan;A. Owen
Abstract When a plain Monte Carlo estimate on n samples has variance σ 2/n, then scrambled digital nets attain a variance that is o (1/n) as n→∞. For finite n and an adversarially selected integrand, the variance of a scrambled (t, m, s)-net can be at most Γ σ 2/n for a maximal gain coefficient Γ<∞. The most widely used digital nets and sequences are those of Sobol'. It was previously known that Γ⩽ 2 t 3 s for any nets in base 2. For digital nets, Dick and Pillichshammer (2010) obtained the bound 2 t+ s. In this paper we study digital nets in base 2 and show that Γ⩽ 2 t+ s− 1 for such nets. This bound is a simple, but apparently unnoticed, consequence of a microstructure analysis by Niederreiter and Pirsic in 2001. We obtain a sharper bound that is smaller than this for some digital nets. Our main finding is that all nonzero gain coefficients must be powers of two. A consequence of this latter fact is a simplified algorithm for computing gain coefficients of digital nets in base 2.
DOI:
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发表时间:
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