[Forum SIS] DSE Seminar @ UNIVR - Sept 25, 2019 / N. BOCHKINA (Univ. Edinburgh and ATI)

[Catia Scricciolo]

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              DSE SEMINAR SERIES - UNIVERSITY OF VERONA
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The Department of Economics (DSE), University of Verona, cordially invites
all interested to attend the following seminar:

Speaker: Natalia Bochkina (University of Edinburgh and The Alan Turing Institute)
Title: Bernstein-von Mises theorem in semi-parametric non-regular mixture model
Date: September 25th, 2019
Time: 12:00
Venue: Polo Santa Marta, Via Cantarane 24, Room 1.59 (Sala Vaona)


Abstract:
We consider the problem of density estimation where the density has unknown lower support point, under local asymptotic exponentiality. To obtain the local concentration result for the marginal posterior of the lower support (Bernstein-von Mises type theorem), we constructed an adaptive mixture prior for a decreasing density with the following properties: a) posterior distribution of the density with known lower support point concentrates at the minimax rate, up to log factor, b) the density is estimated consistently, uniformly in a neighbourhood of the lower support point, c) marginal posterior distribution of the lower support point of the density has shifted exponential distribution in the limit. In particular, to ensure that the density is asymptotically consistent pointwise in a neighbourhood of the lower support point, instead of usual Dirichlet mixture weights, we consider a non-homogeneous Completely Random Measure mixture. The general conditions for the BvM type result we have are different from those by Knapik and Kleijn (2013); the latter do not hold for a hierarchical mixture prior we consider. We illustrate performance of this approach on simulated data, and apply it to model distribution of bids in procurement auctions.

(Joint work with Judith Rousseau, Jean-Bernard Salomond, Johan van der Molen Moris).


For more information on the DSE Seminar Series, please visit
http://www.dse.univr.it/?ent=seminario&lang=en


Best regards,
C. Scricciolo


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