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DEGREE PROFILE OF HIERARCHICAL LATTICE NETWORKS

Published online by Cambridge University Press:  13 September 2016

Yarong Feng ,
Hosam Mahmoud  and
Ludger Rüschendorf
Yarong Feng
Affiliation:
Department of Statistics, The George Washington University, Washington, DC 20052, USA E-mails: yfeng14@gwu.edu; hosam@gwu.edu
Hosam Mahmoud
Affiliation:
Department of Statistics, The George Washington University, Washington, DC 20052, USA E-mails: yfeng14@gwu.edu; hosam@gwu.edu
Ludger Rüschendorf
Affiliation:
Department of Mathematical Stochastics, University of Freiburg, Eckerstraße 1, D-79104 Freiburg, Germany E-mail: ruschen@stochastik.uni-freiburg.de
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Abstract

We study the degree profile of random hierarchical lattice networks. At every step, each edge is either serialized (with probability p) or parallelized (with probability 1−p). We establish an asymptotic Gaussian law for the number of nodes of outdegree 1, and show how to extend the derivations to encompass asymptotic limit laws for higher outdegrees. The asymptotic joint distribution of the number of nodes of outdegrees 1 and 2 is shown to be bivariate normal. No phase transition with p is detected in these asymptotic laws.

For the limit laws, we use ideas from the contraction method. The recursive equations which we get involve coefficients and toll terms depending on the recursion variable and thus are not in the standard form of the contraction method. Yet, an adaptation of the contraction method goes through, showing that the method has promise for a wider range of random structures and algorithms.

Keywords

applied probabilitygraphsprobabilistic networksstochastic modelling
Type
Research Article
Information
Probability in the Engineering and Informational Sciences , Volume 31 , Issue 1 , January 2017 , pp. 60 - 82
Copyright
Copyright © Cambridge University Press 2016 

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