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Start Over Subject Cox model

1. Dynamic dependence ordering for Archimedean copulas and distorted copulas

Creator:
Charpentier, Arthur
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Archimedean copulas, Cox model, dependence, distorted copulas, and ordering
Language:
English
Description:
This paper proposes a general framework to compare the strength of the dependence in survival models, as time changes, i.e. given remaining lifetimes X, to compare the dependence of X given X>t, and X given X>s, where s>t. More precisely, analytical results will be obtained in the case the survival copula of X is either Archimedean or a distorted copula. The case of a frailty based model will also be discussed in details.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

2. Estimation of reliability characteristics of power oil transformers

Creator:
Hammer, Miloš, Ertl, Jakub, and Janda, Ondřej
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
power oil transformer, reliability analysis, Cox model, and factor analysis
Language:
English
Description:
At present days, the requirements on reliability analysis of power oil transformers are increasing in technical practice. Properly estimated reliability characteristics inform the user how to service machine, and such estimation also saves the user‘s financial means. In the first part of this paper, the models for estimating reliability characteristics only from a set of times to failure of power oil transformers are described. Additionally, the Cox model, which enables for such machines to complete reliability analysis with diagnostic measurements, is introduced. In the last part of this paper, the Cox model is enhanced by factor analysis and moreover, the acquired results are compared with real behaviour of tested power oil transformers during operation. and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public