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A lower bound for the variance of real zeros of random polynomials 

Authors: V. Thangaraj a; N. Renganathan b
Affiliations:   a University of Madras, Madras, India
b Department of Mathematics, Annamalai University, India
DOI: 10.1080/07362999008809219
Publication Frequency: 6 issues per year
Published in: journal Stochastic Analysis and Applications, Volume 8, Issue 4 1990 , pages 463 - 481
Formats available: PDF (English)
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Abstract

Let ./LSAA_A_8809219_O_XML_IMAGES/LSAA_A_8809219_O_ILM0001.gif  be a random id algebraic polynomial where lcubaircub is a sequence of independent identically distributed ( iid ) standard normal random variables. In this paper we have obtained a lower bound for the variance of the number of real zeros .of the random algebraic polynomials Qn(x). We have shown that the bound is ./LSAA_A_8809219_O_XML_IMAGES/LSAA_A_8809219_O_ILM0002.gif  for sufficiently large n. Our estimate is./LSAA_A_8809219_O_XML_IMAGES/LSAA_A_8809219_O_ILM0003.gif  times that of Maslova (1974). We have also presented a graph and a comparison table illustrating the values of variances
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