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Variance and covariance inequalities for truncated joint normal distribution via monotone likelihood ratio and log-concavity

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  • Mukerjee, Rahul
  • Ong, S.H.

Abstract

Let X∼Nv(0,Λ) be a normal vector in v(≥1) dimensions, where Λ is diagonal. With reference to the truncated distribution of X on the interior of a v-dimensional Euclidean ball, we completely prove a variance inequality and a covariance inequality that were recently discussed by Palombi and Toti (2013). These inequalities ensure the convergence of an algorithm for the reconstruction of Λ only on the basis of the covariance matrix of X truncated to the Euclidean ball. The concept of monotone likelihood ratio is useful in our proofs. Moreover, we also prove and utilize the fact that the cumulative distribution function of any positive linear combination of independent chi-square variates is log-concave, even though the same may not be true for the corresponding density function.

Suggested Citation

  • Mukerjee, Rahul & Ong, S.H., 2015. "Variance and covariance inequalities for truncated joint normal distribution via monotone likelihood ratio and log-concavity," Journal of Multivariate Analysis, Elsevier, vol. 139(C), pages 1-6.
    • Handle: RePEc:eee:jmvana:v:139:y:2015:i:c:p:1-6
    DOI: 10.1016/j.jmva.2015.02.010
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    References listed on IDEAS

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    1. Palombi, Filippo & Toti, Simona, 2013. "A note on the variance of the square components of a normal multivariate within a Euclidean ball," Journal of Multivariate Analysis, Elsevier, vol. 122(C), pages 355-376.
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