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A dynamic model for the risk of bladder cancer progression

Porta, Núria; Calle, M. Luz; Malats i Riera, Núria; Gómez, Guadalupe (Wiley, 2012)

We propose a multistate modeling approach to describe the observed evolution of patients diagnosed with nonmuscle- invasive bladder cancer. On the basis of data from the Spanish Bladder Cancer/EPICURO study, we adjust a ...
A generalized Fleming and Harrington’s class of tests for interval-censored data

Oller, Ramon; Gómez, Guadalupe (Société statistique du Canada, 2012)

The class Gρ,λ of weighted log-rank tests proposed by Fleming & Harrington [Fleming & Harrington (1991) Counting Processes and Survival Analysis, Wiley, New York] has been widely used in survival analysis and is nowadays, ...
A Semiparametric hierarchical method for a regression model with an interval-censored covariate

Calle, M. Luz; Gómez, Guadalupe (Blackwell Publishers, 2005)

A Bayesian framework is proposed for analysing regression models in which one of the covariates is interval-censored. Such a situation was encountered in an AIDS clinical trial in which the goal was to examine the ...
Bayesian survival analysis modeling applied to sensory shelf life of foods

Calle, M. Luz; Hough, Guillermo; Curia, Ana; Gómez, Guadalupe (Elsevier, 2006)

Data from sensory shelf-life studies can be analyzed using survival statistical methods. The objective of this research was to introduce Bayesian methodology to sensory shelf-life studies and discuss its advantages in ...
FARMS: A New Algorithm for Variable Selection

Pérez-Alvarez, Susana; Gómez, Guadalupe; Brander, Christian (2015)

Large datasets including an extensive number of covariates are generated these days in many different situations, for instance, in detailed genetic studies of outbreed human populations or in complex analyses of immune ...
Frequentist and Bayesian approaches for interval-censored data

Gómez, Guadalupe; Calle, M. Luz; Oller, Ramon (Springer, 2004)

Interval censoring appears when the event of interest is only known to have occurred within a random time interval. Estimation and hypothesis testing procedures for interval-censored data are surveyed. We distinguish ...
Interval censoring: identifiability and the constant-sum property

Oller, Ramon; Gómez, Guadalupe; Calle, M. Luz (Oxford University Press, 2007)

The constant-sum property given in Oller et al. (2004) for censoring models justifies the use of a simplified likelihood to obtain the nonparametric maximum likelihood estimator of the lifetime distribution. In this paper ...
Interval censoring: model characterizations for the validity of the simplified likelihood

Oller, Ramon; Gómez, Guadalupe; Calle, M. Luz (Société statistique du Canada, 2004)

En analyse de durées de vie, le problème de la censure par intervalle a généralement été traité par des méthodes vraisemblantistes. Comme la vraisemblance est complexe, on suppose souvent que les mécanismes de censure ...
Likelihood inferences with interval-censored data

Oller, Ramon; Gómez, Guadalupe; Calle, M. Luz (Universitat de Vic, 28-04-2003)

En l’anàlisi de la supervivència el problema de les dades censurades en un interval es tracta, usualment,via l’estimació per màxima versemblança. Amb l’objectiu d’utilitzar una expressió simplificada de la funció de ...
Nonparametric Bayesian estimation from interval-censored data using Monte Carlo methods

Calle, M. Luz; Gómez, Guadalupe (Elsevier, 2001)

We study the estimation of the survival function based on interval-censored data from a nonparametric Bayesian point of view. Interval censoring arises when the time variable of interest cannot be directly observed and ...
Risk of HIV infection as a function of the duration of intravenous drug use: a non-parametric Bayesian approach

Gómez, Guadalupe; Calle, M. Luz; Egea, José M.; Muga, Robert (John Wiley & Sons, 2000)

We analyse the elapsed time between intravenous (IV) drug initiation and HIV infection in a cohort of 972 injecting drug users attending a hospital detoxi cation unit. We use the time of seroconversion instead of the time ...
The HLA-C*04:01/KIR2DS4 gene combination and human leukocyte antigen alleles with high population frequency drive rate of HIV disease progression

Olvera, Alex; Pérez-Alvarez, Susana; Ibarrondo, Javier; Ganoza, C.; Lama, Javier R.; Lucchetti, Aldo; Cate, Steven; Hildebrand, William; Bernard, Nicole; Gómez, Guadalupe; Sanchez, Jorge; Brander, Christian (Wolters Kluwer Health, 2015)

Objective: The objective of this study is to identify human leukocyte antigen (HLA) class I and killer-cell immunoglobulin-like receptor (KIR) genotypes associated with different risks for HIV acquisition and HIV disease ...
Tutorial on methods for interval-censored data and their implementation in R

Gómez, Guadalupe; Calle, M. Luz; Oller, Ramon; Langohr, Klaus (Sage, 2009)

Interval censoring is encountered in many practical situations when the event of interest cannot be observed and it is only known to have occurred within a time window. The theory for the analysis of interval-censored ...

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