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Qualitative inequalities for squared partial correlations of a Gaussian random vector

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  • Sanjay Chaudhuri

Abstract

We describe various sets of conditional independence relationships, sufficient for qualitatively comparing non-vanishing squared partial correlations of a Gaussian random vector. These sufficient conditions are satisfied by several graphical Markov models. Rules for comparing degree of association among the vertices of such Gaussian graphical models are also developed. We apply these rules to compare conditional dependencies on Gaussian trees. In particular for trees, we show that such dependence can be completely characterised by the length of the paths joining the dependent vertices to each other and to the vertices conditioned on. We also apply our results to postulate rules for model selection for polytree models. Our rules apply to mutual information of Gaussian random vectors as well. Copyright The Institute of Statistical Mathematics, Tokyo 2014

Suggested Citation

  • Sanjay Chaudhuri, 2014. "Qualitative inequalities for squared partial correlations of a Gaussian random vector," Annals of the Institute of Statistical Mathematics, Springer;The Institute of Statistical Mathematics, vol. 66(2), pages 345-367, April.
    • Handle: RePEc:spr:aistmt:v:66:y:2014:i:2:p:345-367
    DOI: 10.1007/s10463-013-0417-x
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