Young-mok Lee
Seoul National University · 数学
研究室紹介
Professor Young-mok Lee's research lab specializes in advanced statistical modeling, particularly in hierarchical generalized linear models, mixed-effects models, and structured dispersion analysis. The lab focuses on developing robust likelihood-based inference methods—such as h-likelihood and restricted maximum likelihood—for complex data structures, including overdispersed and non-normal responses. Key research directions include joint modeling of mean and dispersion, applications in quality improvement and epidemiological data, and the integration of quasi-likelihood and random-effects approaches. The lab also explores theoretical and practical connections between multinomial and Poisson models in overdispersed settings.
Research Overview
Research Output Trend
Figures are computed from collected data and may differ slightly.
Selected Papers
15SUMMARY We consider hierarchical generalized linear models which allow extra error components in the linear predictors of generalized linear models. The distribution of these components is not restricted to be normal; this allows a broader class of models, which includes generalized linear mixed models. We use a generalization of Henderson's joint likelihood, called a hierarchical or h-likelihood, for inferences from hierarchical generalized linear models. This avoids the integration that is nec
Hierarchical generalised linear models are developed as a synthesis of generalised linear models, mixed linear models and structured dispersions. We generalise the restricted maximum likelihood method for the estimation of dispersion to the wider class and show how the joint fitting of models for mean and dispersion can be expressed by two interconnected generalised linear models. The method allows models with (i) any combination of a generalised linear model distribution for the response with a
Abstract Generalized linear models provide a useful tool for analyzing data from quality‐improvement experiments. We discuss why analysis must be done for all the data, not just for summarizing quantities, and show by examples how residuals can be used for model checking. A restricted‐maximum‐likelihood‐type adjustment for the dispersion analysis is developed.
SUMMARY For non-normal data assumed to have distributions, such as the Poisson distribution, which have an a priori dispersion parameter, there are two ways of modelling overdispersion: by a quasi-likelihood approach or with a random-effect model. The two approaches yield different variance functions for the response, which may be distinguishable if adequate data are available. The epilepsy data of Thall and Vail and the fabric data of Bissell are used to exemplify the ideas.
SUMMARY The human sex ratio data, collected in Saxony in the 19th century by Geissler, are reanalysed by joint modelling of the mean and dispersion. Extended quasi-likelihood and the unnormalized double-exponential family are shown to lead to identical inference. The use of the unnormalized form is discussed. The relationship between multinomial and Poisson models is studied for overdispersed data.
Diversite culturelle, droits de l'homme, tolerance LEE Young-Mock La notion de diversite culturelle, malgre l'engouement presque mondial qu'elle connaît aujourd'hui, est loin d'obtenir le statut de veritable concept philosophique, politque ou juridique. L'absence d'une definition precise entraîne des abus deplorables qui vont de simples malentendus jusqu'a la recuperation publicitaire et mercantile du terme. Notre propos dans cette etude est d'enrichir les reflexions sur la notion
Abstract The quasilikelihood estimator is widely used in data analysis where a likelihood is not available. We illustrate that with a given variance function it is not only conservative, in minimizing a maximum risk, but also robust against a possible misspecification of either the likelihood or cumulants of the model. In examples it is compared with estimators based on maximum likelihood and quadratic estimating functions.
Le propos de cette eˊ tude consistait à eˊ tablir des rapports entre l’ identiteˊpolitique et l’ imagination politique dans les textes principaux des deux représentants respectifs de la pensée coloniale et de la pensée postcoloniale:Albert Memmi et Achille Mbembe. Nous avons supposé que les différences de deux pensées - rôle déterminant des facteurs socio-économiques dans le système colonial dans la pensée coloniale et mise en valeur du culturel dans la pensée postcoloniale - produiraient les s
En terme d'integration sociale, les harkis et leurs enfants se trouvent dans une situation tres particuliere par rapport aux autres immigres d'origine nord-africaine. A la difference de ces derniers, les harkis et leurs enfants possedent la nationalite française, qui est consideree comme preuve definitive de la reussite de l'integration. Mais ils ont, pour la plupart, une grande difficulte a s'integrer dans la societe française. Cet echec, a notre avis, est lie a des problemes non
Notre propos consiste à étudier de plus près un des aspects originaux de l’écriture de Diderot, qui consiste à une sorte de «double écriture», expression littéraire de la «double doctrine» ou «double philosophie». D'abord, nous constatons la condamnation et, en même temps, l'usage de la double écriture dans les articles de l'Encyclopédie. Ce «bon usage» consiste dans l'usage mixte de la langue savante et la langue vulgaire, dans le système des renvois et surtout dans la forme assez classique d
라메트리가 1750년 『철학 저작』에 붙인 「서문」은 그의 철학적 입장의 최종 표명인 동시에 그의 글쓰기의 원칙의 표명이다. 그 글쓰기는 ‘대담한 글쓰기’이다. ‘대담한 글쓰기’는 글쓰기의 자유를 전제조건으로 하지만 그것과는 다르다. 라메트리는 이중적 글쓰기와는 반대로 모든 가면을 벗고 용기 있게 자신을 드러내는 글쓰기를 요구한다. 「서문」의 이론적 기획은 그 자체로 일관된 철학 체계를 구축하기 보다는 글쓰기의 자유에 철학적 원칙을 제공하는 데 쓰인다. 그리고 이렇게 획득된 자유에 바탕을 둔 ‘대담한 글쓰기’는 라메트리에게 있어서 철학이 가진 그 투쟁적 성격을 반영한다. 라메트리는 철학을 거울의 이미지로 표현하는데, 이 거울은 반영의 거울이 아니라 무기로서의 거울인 ‘화경’이다. 칸트가 “Sapere aude”를 계몽주의의 표어로 제시하기 이미 30여 년 전, 라메트리는 “글쓰기의 용기 Scribere aude”를 철학자의 표어로 제시한다. “앎의 용기”, “스스로 생각할 용기”가
Le propos de cette étude consiste à comprendre le texte original et sans précédent qu'est Le Tableau de Paris à partir de la notion de 'tableau'. Nous partons de l'hypothèse selon laquelle les essais et tâtonnements pratiques et théoriques de Mercier le dramaturge lui a permis de développer cette écriture inédite. Selon Mercier, la littérature et le théâtre en particulier ont deux missions, ou fonctions, essentielles : réaliste et sociale. La valeur authentique de la littérature ne réside pas da