Concentration of measures via size-biased couplings
Concentration of measures via size-biased couplings
复制标题
通过尺寸偏向耦合来集中措施
DOI:
10.1007/s00440-009-0253-3
复制
发表时间:
2009
影响因子:
2
通讯作者:
L. Goldstein
中科院分区:
文献类型:
--
作者:
Subhankar Ghosh;L. Goldstein
AbstractLet Y be a nonnegative random variable with mean μ and finite positive variance σ2, and let Ys, defined on the same space as Y, have the Y size-biased distribution, characterized by
$$ E[Yf(Y)]=\mu E f(Y^s) \quad {\rm for\,all\,functions}\,f\,{\rm for\,which\,these\,expectations\,exist}. $$Under a variety of conditions on Y and the coupling of Y and Ys, including combinations of boundedness and monotonicity, one sided concentration of measure inequalities such as
$$ P\left(\frac{Y-\mu}{\sigma}
\ge t\right)\le {\rm exp}\left(-\frac{t^2}{2(A+Bt)}
\right) \quad {\rm for\,all}\,t\, > 0 $$hold for some explicit A and B. The theorem is applied to the number of bulbs switched on at the terminal time in the so called lightbulb process of Rao et al. (Sankhyā 69:137–161, 2007).