## Set of Gaussian Random Variables

### BibTeX

@MISC{Sinha_setof,

author = {Debjit Sinha and Hai Zhou and Senior Member and Narendra V. Shenoy and Senior Member},

title = {Set of Gaussian Random Variables},

year = {}

}

### OpenURL

### Abstract

Abstract—This paper quantifies the approximation error when results obtained by Clark (Oper. Res., vol. 9, p. 145, 1961) are employed to compute the maximum (max) of Gaussian random variables, which is a fundamental operation in statistical timing. We show that a finite lookup table can be used to store these errors. Based on the error computations, approaches to different orderings for pairwise max operations on a set of Gaussians are proposed. Experimental results show accuracy improvements in the computation of the max of multiple Gaussians, in comparison to the traditional approach. In addition, we present an approach to compute the tightness probabilities of Gaussian random variables with dynamic runtime-accuracy tradeoff options. We replace required numerical computations for their estimations by closed form expressions based on Taylor series expansion that involve table lookup and a few fundamental arithmetic operations. Experimental results demonstrate an average speedup of 2 × using our approach for computing the maximum of two Gaussians, in comparison to the traditional approach, without any accuracy penalty. Index Terms—Computer-aided design (CAD), Gaussian approximation, statistical timing, very large-scale integration