GEYS, Helena

Full Name
GEYS, Helena
Email
helena.geys@uhasselt.be
 
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Publications

Results 1-101 of 101 (Search time: 0.003 seconds).

Issue DateTitleContributor(s)TypeCat.
12023Measures of spatial heterogeneity in the liver tissue micro-environment as predictive factors for fibrosis scoreAGTEN, Annelies; Blazquez-Moreno, Alfonso; Crabbe, Marjolein; Tuefferd, Marianne; Goehlmann, Hinrich; GEYS, Helena; Peng, Cheng-Yuan; CLAES, Jari; NEYENS, Thomas; FAES, ChristelJournal ContributionA1
22021Bayesian pooling versus sequential integration of small preclinical trials: a comparison within linear and nonlinear modeling frameworksLA GAMBA, Fabiola; JACOBS, Tom; SERROYEN, Jan; GEYS, Helena; FAES, ChristelJournal ContributionA1
32019Bayesian sequential integration within a preclinical pharmacokinetic and pharmacodynamic modeling framework: Lessons learnedLA GAMBA, Fabiola; JACOBS, Tom; GEYS, Helena; Jaki, Thomas; SERROYEN, Jan; Ursino, Moreno; Russu, Alberto; FAES, ChristelJournal ContributionA1
42019Marginalized models for right-truncated and interval-censored time-to-event dataCHEBON, Sammy; FAES, Christel; De Smedt, Ann; GEYS, HelenaJournal ContributionA1
52019Univariate Versus Multivariate Surrogates in the Single-Trial SettingVAN DER ELST, Wim; Alonso, Ariel Abad; GEYS, Helena; MEYVISCH, Paul; Bijnens, Luc; SENGUPTA, Rudradev; MOLENBERGHS, GeertJournal ContributionA1
62018A Bayesian K-PD model for synergy: A case studyLA GAMBA, Fabiola; JACOBS, Tom; GEYS, Helena; Ver Donck, Luc; FAES, ChristelJournal ContributionA1
72017Models for zero-inflated, correlated count data with extra heterogeneity: when is it too complex?CHEBON, Sammy; FAES, Christel; Cools, Frank; GEYS, HelenaJournal ContributionA1
82016Detecting influential observations in a model-based cluster analysisBRUCKERS, Liesbeth; MOLENBERGHS, Geert; VERBEKE, Geert; GEYS, HelenaJournal ContributionA1
92015Flexible modelling of simultaneously interval censored and truncated time-to-event dataCHEBON, Sammy; FAES, Christel; De Smedt, Ann; GEYS, HelenaJournal ContributionA1
102015A clustering algorithm for multivariate longitudinal dataBRUCKERS, Liesbeth; MOLENBERGHS, Geert; Drinkenburg, P.; GEYS, HelenaJournal ContributionA1
112014Abuse liability assessment in preclinical drug development: Predictivity of a translational approach for abuse liability testing using methylphenidate in four standardized preclinical study modelsTEUNS, Greet; GEYS, Helena; Geuens, Sonja M. A.; STINISSEN, Piet; MEERT, TheoJournal ContributionA1
122013A Bayesian, generalized frailty model for comet assaysHABTEAB GHEBRETINSAE, Aklilu; FAES, Christel; MOLENBERGHS, Geert; De Boeck, Marlies; GEYS, HelenaJournal ContributionA1
132012Mixed outcomesMOLENBERGHS, Geert; GEYS, HelenaBook SectionB2
142012Joint modeling of hierarchically clustered and overdispersed non-gaussian continuous outcomes for comet assay dataHABTEAB GHEBRETINSAE, Aklilu; FAES, Christel; MOLENBERGHS, Geert; GEYS, Helena; Van der Leede, Bas-JanJournal ContributionA1
152012A Meta-Analytical Framework to Include Historical Data in Allometric ScalingBIJNENS, Luc; Van Den Bergh, An; Sinha, Vikash; GEYS, Helena; MOLENBERGHS, Geert; Verbeke, Tobias; KASIM, Adetayo; STRAETEMANS, Roel; De Ridder, Filip; Balmain-Mackie, ClaireJournal ContributionA1
162010Correction for Model Selection Bias Using a Modified Model Averaging Approach for Supervised Learning Methods Applied to EEG ExperimentsWOUTERS, Kristien; CORTINAS ABRAHANTES, Jose; MOLENBERGHS, Geert; GEYS, Helena; BIJNENS, Luc; Ahnaou, Abdellah; Drinkenburg, W.H.I.M.Journal ContributionA1
172010Genomic Biomarkers for Depression: Feature-Specific and Joint BiomarkersTILAHUN ESHETE, Abel; LIN, Dan; SHKEDY, Ziv; GEYS, Helena; ALONSO ABAD, Ariel; Peeters, Pieter; TALLOEN, Willem; Drinkenburg, Wilhelmus; Goehlmann, Hinrich; Gorden, Evian; BIJNENS, Luc; MOLENBERGHS, GeertJournal ContributionA1
182010A Unified Approach to Multi-item ReliabilityALONSO ABAD, Ariel; LAENEN, Annouschka; MOLENBERGHS, Geert; GEYS, Helena; VANGENEUGDEN, TonyJournal ContributionA1
192010Marginal Correlation in Longitudinal Binary Data Based on Generalized Linear Mixed ModelsVANGENEUGDEN, Tony; MOLENBERGHS, Geert; LAENEN, Annouschka; GEYS, Helena; BEUNCKENS, Caroline; SOTTO, CristinaJournal ContributionA1
202009Investigating Association Between Behavior, Corticosterone, Heart Rate, and Blood Pressure in Rats Using Surrogate Marker Evaluation MethodologyTILAHUN ESHETE, Abel; MARINGWA, John; GEYS, Helena; ALONSO ABAD, Ariel; Raeymaekers, Leen; MOLENBERGHS, Geert; Van Den Kieboom, Gerd; Drinkenburg, Pim; BIJNENS, LucJournal ContributionA1
212009Application of Penalized Splines in Analyzing Neuronal DataMARINGWA, John; FAES, Christel; GEYS, Helena; MOLENBERGHS, Geert; Cadarso-Suarez, Carmen; Pardo-Vazquez, Jose L.; Leboran, Victor; Acuna, CarlosJournal ContributionA1
222009Modeling spatial learning in rats based on Morris water maze experimentsFAES, Christel; AERTS, Marc; GEYS, Helena; De Schaepdrijver, L.Journal ContributionA1
232008Joint models of discrete and continuous longitudinal dataFAES, Christel; GEYS, Helena; CATALANO, PaulBook SectionB2
242008A high-dimensional joint model for longitudinal outcomes of different natureFAES, Christel; AERTS, Marc; MOLENBERGHS, Geert; GEYS, Helena; TEUNS, Greet; BIJNENS, LucJournal ContributionA1
252008Application of Semiparametric Mixed Models and Simultaneous Confidence Bands in a Cardiovascular Safety Experiment with Longitudinal DataMARINGWA, John; GEYS, Helena; SHKEDY, Ziv; FAES, Christel; MOLENBERGHS, Geert; AERTS, Marc; Van Ammel, Karel; Teisman, Ard; BIJNENS, LucJournal ContributionA1
262008A flexible method to measure synchrony in neuronal firingFAES, Christel; GEYS, Helena; MOLENBERGHS, Geert; AERTS, Marc; Cadarso-Suarez, Carmen; Acuna, Carlos; Cano, MonicaJournal ContributionA1
272007Psychotropic drug classification based on sleep-wake behaviour of ratsWOUTERS, Kristien; Ahnaou, Abdellah; CORTINAS ABRAHANTES, Jose; MOLENBERGHS, Geert; GEYS, Helena; BIJNENS, Luc; Drinkenburg, Wilhelmus H. I. M.Journal ContributionA1
282007Model averaging using fractional polynomials to estimate a safe level of exposureFAES, Christel; AERTS, Marc; GEYS, Helena; MOLENBERGHS, GeertJournal ContributionA1
292007Classification of sporadic Creutzfeldt-Jakob disease based on clinical and neuropathological characteristicsCORTINAS ABRAHANTES, Jose; AERTS, Marc; van Everbroeck, Bart; Saegerman, Claude; Berkvens, Dirk; GEYS, Helena; Mintiens, Koen; Roels, Stefan; Cras, PatrickJournal ContributionA1
302007Generalizability in non-Gaussian longitudinal clinical trial data based on generalized linear mixed modelsVANGENEUGDEN, Tony; MOLENBERGHS, Geert; LAENEN, Annouschka; ALONSO ABAD, Ariel; GEYS, HelenaJournal ContributionA1
312007On the use of historical control data in pre-clinical safety studiesMARINGWA, John; FAES, Christel; AERTS, Marc; GEYS, Helena; TEUNS, Greet; Van Den Poel, B.; BIJNENS, LucJournal ContributionA1
322006Generalized reliability estimation using repeated measurementsLAENEN, Annouschka; VANGENEUGDEN, Tony; GEYS, Helena; MOLENBERGHS, GeertJournal ContributionA1
332006A hierarchical modeling approach for risk assessment in developmental toxicity studiesFAES, Christel; GEYS, Helena; AERTS, Marc; MOLENBERGHS, GeertJournal ContributionA1
342006Estimating herd-specific force of infection by using random-effects models for clustered binary data and monotone fractional polynomialsFAES, Christel; HENS, Niel; AERTS, Marc; SHKEDY, Ziv; GEYS, Helena; Mintiens, K.; Laevens, H; Boelaert, FJournal ContributionA1
352006Dose response for infectivity of several strains of Campylobacter jejuni in chickensChen, L; GEYS, Helena; Cawthraw, S; Teunis, PJournal ContributionA1
362006GLMM approach to study the spatial and temporal evolution of spikes in the small intestineFAES, Christel; AERTS, Marc; GEYS, Helena; BIJNENS, Luc; Donck, LV; Lammers, WJEPJournal ContributionA1
372006A unifying approach for surrogate marker validation based on Prentice's criteriaALONSO ABAD, Ariel; MOLENBERGHS, Geert; GEYS, Helena; BUYSE, Marc; VANGENEUGDEN, TonyJournal ContributionA1
382005Validation using single-trial data: mixed binary and continuous outcomesGEYS, HelenaBook SectionB2
392005Repeated measures and surrogate endpoint validationALONSO ABAD, Ariel; GEYS, Helena; VANGENEUGDEN, TonyBook SectionB3
402005Surrogate marker validation in mental healthVANGENEUGDEN, Tony; ALONSO ABAD, Ariel; GEYS, Helena; LAENEN, AnnouschkaBook SectionB2
412005Meta-analytic validation with binary outcomesRENARD, Didier; GEYS, HelenaBook SectionB2
422005Modelling the Herd-specific force of infection for BoHV-1: the influence of missing dataHENS, Niel; FAES, Christel; AERTS, Marc; SHKEDY, Ziv; GEYS, Helena; Mintiens, K.; Laevens, H; Boelaert, FProceedings PaperC2
432005Further validation of the quinpirole-induced compulsive checking paradigm as a model for obsessive-compulsive disorder (OCD)-restraint stress exacerbates some compulsive checking measuresMan, J; Hudson, AL; Nutt, DJ; Ashton, D.; GEYS, HelenaJournal ContributionM
442005Is herpes zoster a marker for occult or subsequent malignancy?Buntinx, F; Wachana, R; Bartholomeeusen, Stefaan; Sweldens, K; GEYS, HelenaJournal ContributionA1
452005Applying concepts of generalizability theory on clinical trial data to investigate sources of variation and their impact on reliabilityVANGENEUGDEN, Tony; LAENEN, Annouschka; GEYS, Helena; RENARD, Didier; MOLENBERGHS, GeertJournal ContributionA1
462004Applying linear mixed models to estimate reliability in clinical trial data with repeated measurementsVANGENEUGDEN, Tony; LAENEN, Annouschka; GEYS, Helena; RENARD, Didier; MOLENBERGHS, GeertJournal ContributionA1
472004Statistical methods for EEG dataCORTINAS ABRAHANTES, Jose; SERROYEN, Jan; GEYS, Helena; MOLENBERGHS, Geert; Drinkenburg, Wihelmus H.I.M.Proceedings PaperC2
482004Prentice's approach and the meta-analytic paradigm: a reflection on the role of statistics in the evaluation of surrogate endpointsALONSO ABAD, Ariel; MOLENBERGHS, Geert; BURZYKOWSKI, Tomasz; RENARD, Didier; GEYS, Helena; SHKEDY, Ziv; TIBALDI, Fabian; CORTINAS ABRAHANTES, Jose; BUYSE, MarcJournal ContributionA1
492004Validation of surrogate markers in multiple randomized clinical trials with repeated measurements: Canonical correlation approachALONSO ABAD, Ariel; GEYS, Helena; MOLENBERGHS, Geert; Kenward, Michael G.; VANGENEUGDEN, TonyJournal ContributionA1
502004A pairwise likelihood approach to estimation in multilevel probit modelsRENARD, Didier; MOLENBERGHS, Geert; GEYS, HelenaJournal ContributionA1
512004Bayesian testing for trend in a power model for clustered binary dataFAES, Christel; AERTS, Marc; GEYS, Helena; MOLENBERGHS, Geert; DECLERCK, LievenJournal ContributionA1
522004Modeling combined continuous and ordinal outcomes in a clustered settingFAES, Christel; GEYS, Helena; AERTS, Marc; MOLENBERGHS, Geert; CATALANO, PaulJournal ContributionA1
532004Pseudo-likelihood estimation for a marginal multivariate survival modelTIBALDI, Fabian; MOLENBERGHS, Geert; BURZYKOWSKI, Tomasz; GEYS, HelenaJournal ContributionA1
542003Multivariate Plackett-Dale inference to study the inheritance of longevity in a Belgian villageTIBALDI, Fabian; Van de Putte, Bart; GEYS, Helena; MOLENBERGHS, Geert; Matthijs, Koen; Vlietinck, RobertProceedings PaperC2
552003Validation of biomarkers as surrogates for clinical endpointsBUYSE, Marc; VANGENEUGDEN, Tony; BIJNENS, Luc; RENARD, Didier; BURZYKOWSKI, Tomasz; GEYS, Helena; MOLENBERGHS, GeertBook SectionB3
562003Hierarchical modelling approach for risk assessment in developmental toxicity studiesFAES, Christel; GEYS, Helena; AERTS, Marc; MOLENBERGHS, GeertProceedings PaperC1
572003A Bayesian hierarchical model for the analysis of multivariate outcomes from developmental toxicity studiesFAES, Christel; GEYS, Helena; AERTS, Marc; MOLENBERGHS, GeertJournal ContributionA2
582003Validation of surrogate markers in multiple randomized clinical trials with repeated measuresALONSO ABAD, Ariel; GEYS, Helena; MOLENBERGHS, Geert; Kenward, Michael G.; VANGENEUGDEN, TonyJournal ContributionA1
592003Validation of a longitudinally measured surrogate for a time-to-event endpointRENARD, Didier; GEYS, Helena; MOLENBERGHS, Geert; BURZYKOWSKI, Tomasz; BUYSE, Marc; VANGENEUGDEN, Tony; BIJNENS, LucJournal ContributionA1
602003Geographical differences in cancer incidence in the Belgian province of LimburgBuntinx, Frank; GEYS, Helena; Lousbergh, D.; BROEDERS, Geert; CLOES, Edith; Dhollander, D.; Op de Beeck, L.; Vandenbrande, J.; Van Waes, A.; MOLENBERGHS, GeertJournal ContributionA1
612003Use of fractional polynomials for dose-response modelling and quantitative risk assessment in developmental toxicity studiesFAES, Christel; GEYS, Helena; AERTS, Marc; MOLENBERGHS, GeertJournal ContributionA1
622002Individual level covariatesWILLIAMS, Paige; GEYS, HelenaBook SectionB2
632002Pseudo-likelihood inferenceGEYS, Helena; MOLENBERGHS, GeertBook SectionB3
642002Mixed OutcomesMOLENBERGHS, Geert; GEYS, HelenaBook SectionB3
652002Pseudo-likelihood estimationGEYS, Helena; MOLENBERGHS, Geert; Ryan, LouiseBook SectionB3
662002Bayesian models in the evaluation of surrogate endpointsTORRES BARBOSA, Franz; TIBALDI, Fabian; CORTINAS ABRAHANTES, Jose; BURZYKOWSKI, Tomasz; GEYS, Helena; Allende, S.; MOLENBERGHS, GeertProceedings PaperC2
672002Generalized Estimating EquationsGEYS, Helena; MOLENBERGHS, Geert; Ryan, LouiseBook SectionB3
682002Validation of surrogate markers in multiple randomized clinical trials with repeated measuresALONSO ABAD, Ariel; GEYS, Helena; MOLENBERGHS, Geert; Kenward, Michael G.; VANGENEUGDEN, TonyProceedings PaperC2
692002Statistical challenges in the evaluation of surrogate endpoints in randomized trialsMOLENBERGHS, Geert; BUYSE, Marc; GEYS, Helena; RENARD, Didier; BURZYKOWSKI, Tomasz; ALONSO ABAD, ArielJournal ContributionA1
702002Challenges in the methodology for the validation of surrogate endpoints in randomized trialsMOLENBERGHS, Geert; BUYSE, Marc; GEYS, Helena; RENARD, Didier; BURZYKOWSKI, TomaszProceedings PaperC2
712002Topics in Modelling of Clustered DataAERTS, Marc; GEYS, Helena; MOLENBERGHS, Geert; Ryan, LouiseBookB3
722002Modelling combined continuous and ordinal outcomes from developmental toxicity studiesFAES, Christel; GEYS, Helena; AERTS, Marc; MOLENBERGHS, Geert; CATALANO, PaulProceedings PaperC2
732002Trend of cervical cancer mortality in Belgium (1954-1994): Tentative solution for the certification problem of unspecified uterine cancerArbyn, Marc; GEYS, HelenaJournal ContributionA1
742002Immunologic parameter evaluation as surrogate of the survival time in patients with advanced lung cancerGonzalez, G; TORRES BARBOSA, Franz; TIBALDI, Fabian; CORTINAS ABRAHANTES, Jose; GEYS, Helena; MOLENBERGHS, GeertJournal ContributionM
752002Prostate-specific antigen screening coverage and prostate cancer incidence rates in the Belgian province of Limburg in 1996-1998Lousbergh, D.; Buntinx, Frank; GEYS, Helena; Du Bois, M.; Dhollander, D.; MOLENBERGHS, GeertJournal ContributionA1
762002Validation of surrogate endpoints in multiple randomized clinical trials with discrete outcomesRENARD, Didier; GEYS, Helena; MOLENBERGHS, Geert; BURZYKOWSKI, Tomasz; BUYSE, MarcJournal ContributionA1
772002Analysis of toxicology data with covariates specific to each observationGEYS, Helena; MOLENBERGHS, Geert; Williams, PaigeJournal ContributionA1
782002Analysis of clustered binary data with covariates specific to each observationGEYS, Helena; MOLENBERGHS, Geert; Williams, Paige L.Journal ContributionA1
792002Investigating the criterion validity of psychiatric symptom scales using surrogate marker validation methodologyALONSO ABAD, Ariel; GEYS, Helena; MOLENBERGHS, Geert; VANGENEUGDEN, TonyJournal ContributionA1
802001Mapping Cancer Incidence in the Province of Limburg, BelgiumGEYS, Helena; Lousbergh, DaniĆ«l; MOLENBERGHS, Geert; Buntinx, FrankResearch ReportR2
812001Methodology for the validation of surrogate endpoints in multiple randomized experimentsMOLENBERGHS, Geert; ALONSO ABAD, Ariel; BURZYKOWSKI, Tomasz; CORTINAS ABRAHANTES, Jose; GEYS, Helena; RENARD, Didier; SHKEDY, Ziv; TIBALDI, Fabian; BUYSE, MarcProceedings PaperC2
822001Methodology of the validation of surrogate endpoints in multiple randomized experimentsMOLENBERGHS, Geert; ALONSO ABAD, Ariel; BURZYKOWSKI, Tomasz; CORTINAS ABRAHANTES, Jose; GEYS, Helena; RENARD, Didier; SHKEDY, Ziv; TIBALDI, Fabian; BUYSE, MarcProceedings PaperC2
832001Flexible quantitative risk assessment for developmental toxicity studiesFAES, Christel; GEYS, Helena; AERTS, Marc; MOLENBERGHS, GeertProceedings PaperC2
842001Multivariate clustered data analysis in developmental toxicity studiesMOLENBERGHS, Geert; GEYS, HelenaJournal ContributionA1
852001Validation of surrogate endpoints in multiple randomized clinical trials with failure-time endpointsBURZYKOWSKI, Tomasz; MOLENBERGHS, Geert; BUYSE, Marc; GEYS, Helena; RENARD, DidierJournal ContributionA1
862001Evaluation of surrogate endpoints in randomized experiments with mixed discrete and continuous outcomesMOLENBERGHS, Geert; GEYS, Helena; BUYSE, MarcJournal ContributionA1
872001Pesticides and mortality from hormone-dependent cancersJANSSENS, Jaak; Van Hecke, Etienne; GEYS, Helena; BRUCKERS, Liesbeth; RENARD, Didier; MOLENBERGHS, GeertJournal ContributionA1
882001Two latent variable risk assessment approaches for combined continuous and discrete outcomes from developmental toxicity dataGEYS, Helena; Regan, Meredith M.; CATALANO, Paul; MOLENBERGHS, GeertJournal ContributionA1
892000Validation of surrogate endpoints in multiple randomized clinical trials with failure-time endpointsBURZYKOWSKI, Tomasz; MOLENBERGHS, Geert; BUYSE, Marc; GEYS, Helena; RENARD, DidierProceedings PaperC1
902000Statistical validation of surrogate endpoints: problems and proposalsBUYSE, Marc; MOLENBERGHS, Geert; BURZYKOWSKI, Tomasz; RENARD, Didier; GEYS, HelenaJournal ContributionA1
912000Flexible quantitative risk assessment for developmental toxicity based on fractional polynomial predictorsGEYS, Helena; MOLENBERGHS, Geert; DECLERCK, Lieven; Ryan, LouiseJournal ContributionA1
922000The validation of surrogate endpoints in meta-analyses of randomized experimentsBUYSE, Marc; MOLENBERGHS, Geert; BURZYKOWSKI, Tomasz; RENARD, Didier; GEYS, HelenaJournal ContributionA1
931999Pseudolikelihood modelling of multivariate outcomes in developmental toxicologyGEYS, Helena; MOLENBERGHS, Geert; Ryan, Louise M.Journal Contribution
941999The validation of surrogate endpoints in meta-analyses of randomized experimentsBUYSE, Marc; MOLENBERGHS, Geert; BURZYKOWSKI, Tomasz; RENARD, Didier; GEYS, HelenaProceedings Paper
951999Pseudo-likelihood methods and generalized estimating equations: efficient estimation techniques for the analysis of correlated multivariate dataGEYS, HelenaTheses and DissertationsT1
961998A Plackett-Dale approach to analyze mixed continuous and discrete dataMOLENBERGHS, Geert; GEYS, HelenaProceedings Paper
971998Analysis of clustered multivariate data from developmental toxicity studiesMOLENBERGHS, Geert; GEYS, Helena; DECLERCK, Lieven; CLAESKENS, Gerda; AERTS, MarcProceedings Paper
981998A note on the comparison of pseudo-likelihood and generalized estimating equations for marginally specified odds ratio modelsGEYS, Helena; MOLENBERGHS, Geert; Lipsitz, Stuart R.Journal Contribution
991997Analysis of clustered binary data with covariates specific to each observationGEYS, Helena; MOLENBERGHS, Geert; Williams, P. L.Proceedings Paper
1001997Pseudo-likelihood inference for clustered binary dataGEYS, Helena; MOLENBERGHS, Geert; Ryan, Louise M.Journal Contribution
1011996Pseudo-likelihood estimation for clustered binary dataGEYS, Helena; MOLENBERGHS, Geert; Ryan, Louise M.Proceedings Paper