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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Consistency of the Spectral Seriation Algorithm

Natik, Amine 01 October 2019 (has links)
Given n arbitrary objects x1, x2, . . . , xn and a similarity matrix P = (pi,j ) 1≤i,j≤n , where pi,j measures the similarity between xi and xj . If the objects can be ordered along a linear chain so that the similarity decreases as the distance increase within this chain, then the goal of the seriation problem is to recover this ordering π given only the similarity matrix. When the data matrix P is completely accurate, the true relative order can be recovered from the spectral seriation algorithm [1]. In most applications, the matrix P is noisy, but the basic spectral seriation algorithm is still very popular. In this thesis, we study the consistency of this algorithm for a wide variety of statistical models, showing both consistency and bounds on the convergence rates. More specifically, we consider a model matrix P satisfying certain assumptions, and construct a noisy matrix Pb where the input (i, j) is a coin flip with probability pi,j . We show that the output πˆ of the spectral seriation algorithm for the random matrix is very close to the true ordering π.

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