HKUEMS :: Event Details

50th Anniv. Seminar Series on 'Network cross-validation by edge sampling' by Professor Ji ZHU
posted by Department of Statistics and Actuarial Science for HKU and Public
Event Type: Public Lecture/Forum/Seminar/Workshop/Conference/Symposium
Event Nature: Science & Technology

Event Details

DEPARTMENT OF STATISTICS AND ACTUARIAL SCIENCE
THE UNIVERSITY OF HONG KONG

50th Anniversary Seminar Series

Professor Ji ZHU
Department of Statistics
University of Michigan
USA

will give a talk

entitled

NETWORK CROSS-VALIDATION BY EDGE SAMPLING

Abstract

Many models and methods are now available for network analysis, but model selection and tuning remain challenging. Cross-validation is a useful general tool for these tasks in many settings, but is not directly applicable to networks since splitting network nodes into groups requires deleting edges and destroys some of the network structure. Here we propose a new network cross-validation strategy based on splitting edges rather than nodes, which avoids losing information and is applicable to a wide range of network problems. We provide a theoretical justification for our method in a general setting, and in particular show that the method has good asymptotic properties under the stochastic block model. Numerical results on both simulated and real networks show that our approach performs well for a number of model selection and parameter tuning tasks. This is joint work with Tianxi Li and Elizaveta Levina.

Date/Time02/06/2017 11:00-12:00
VenueRoom 301, Run Run Shaw Building, HKU
LanguageEnglish
Programmeclick to view
10:45 to 11:00 Refreshments will be served outside Room 301 Run Run Shaw Building
11:00 to 12:00 Seminar

Registration Instruction

Registration is not required.

Contact Information

For further information, please visit:
http://www.saasweb.hku.hk/seminar/seminar.php

Should you have any enquiries, please feel free to contact Ms. Irene Cheung by email at saas@hku.hk or by phone at 39173812 or by fax at 28589041.