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Peakedness of linear forms in ensembles and mixtures

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Author Info
Jensen, D. R.
Abstract

Linear forms are studied in random variables {X1, ... , Xn} having common location-scale parameters ([mu], [sigma]2). For certain distributions on Rn having star-shaped contours and others, it is shown that if q = [q1, ... , qn]' majorizes p = [p1, ... , pn]', then is more peaked about [mu] than than W(q) in the sense of Birnbaum (1948). In particular, the peakedness about [mu] of increases monotonically with n. If neither c nor d majorizes the other, then {W (c), W (d)} are less peaked about [mu] than W (c [logical and] d), and are more peaked than W (c [logical or] d). This extends the findings of Proschan (1965) and Olkin and Tong (1988). Stochastic majorants and minorants for linear estimators are given in certain ensembles, including star-contoured distributions on Rn if ordered by peakedness.

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Publisher Info
Article provided by Elsevier in its journal Statistics & Probability Letters.

Volume (Year): 35 (1997)
Issue (Month): 3 (October)
Pages: 277-282
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Handle: RePEc:eee:stapro:v:35:y:1997:i:3:p:277-282

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Related research
Keywords: Estimating location Weighted averages Concentration Majorization Star-contoured distributions Monotone consistency;

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  1. Rustam Ibragimov, 2004. "Shifting paradigms: on the robustness of economic models to heavy-tailedness assumptions," Econometric Society 2004 Latin American Meetings 105, Econometric Society. [Downloadable!]
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