W
Wai-Sum Chan
Researcher at The Chinese University of Hong Kong
Publications - 118
Citations - 2338
Wai-Sum Chan is an academic researcher from The Chinese University of Hong Kong. The author has contributed to research in topics: Autoregressive model & Time series. The author has an hindex of 24, co-authored 117 publications receiving 2136 citations. Previous affiliations of Wai-Sum Chan include National University of Singapore & Temple University.
Papers
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Journal ArticleDOI
Methods for estimating the case fatality ratio for a novel, emerging infectious disease.
Azra C. Ghani,Christl A. Donnelly,David Cox,Jamie T. Griffin,Christophe Fraser,Tai Hing Lam,L-M Ho,Wai-Sum Chan,Roy M. Anderson,Anthony J. Hedley,Gabriel M. Leung +10 more
TL;DR: The authors propose a novel method for estimating the case fatality ratio based on the Kaplan-Meier survival procedure, jointly considering two outcomes (death and recovery), and evaluate its performance by using data from the 2003 epidemic of severe acute respiratory syndrome in Hong Kong.
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Approximation of polygonal curves with minimum number of line segments or minimum error
Wai-Sum Chan,Francis Y. L. Chin +1 more
TL;DR: The time complexities for solving the polygonal curve approximation problems formulated by Imai and Iri are improved and it is shown that if the curve to be approximated forms part of a convex polygon, the two problems can be solved in O(n) and O( n2) time respectively for both open and closedpolygonal curves.
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The ecology of health care in Hong Kong.
TL;DR: The results indicate that the local community's care-seeking orientation still very much favors western allopathic medicine over traditional Chinese therapy, at least for acute illness episodes, and there was evidence of apparent, substantial "over-consumption" of ambulatory, community-based care.
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Asymptotic properties of covariate-adjusted response-adaptive designs
TL;DR: In this article, a framework for covariate-adjusted response-adaptive (CARA) designs is proposed for the allocation of subjects to K (≥ 2) treatments.
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Some results on ruin probabilities in a two-dimensional risk model
TL;DR: In this paper, three different types of ruin probabilities are defined using some results of one-dimensional risk processes, and simple bounds for the two-dimensional ruin probabilities were obtained using numerical examples and simulation experiments.