2015
Predictors of response to 17-alpha hydroxyprogesterone caproate for prevention of recurrent spontaneous preterm birth
Manuck TA, Esplin MS, Biggio J, Bukowski R, Parry S, Zhang H, Huang H, Varner MW, Andrews W, Saade G, Sadovsky Y, Reddy UM, Ilekis J, Research E. Predictors of response to 17-alpha hydroxyprogesterone caproate for prevention of recurrent spontaneous preterm birth. American Journal Of Obstetrics And Gynecology 2015, 214: 376.e1-376.e8. PMID: 26692181, PMCID: PMC4803498, DOI: 10.1016/j.ajog.2015.12.010.Peer-Reviewed Original ResearchConceptsSpontaneous preterm birthPrevious spontaneous preterm birthRecurrent spontaneous preterm birthDelivery gestational ageRecurrent preterm birthPreterm birthSimilar gestational ageGestational ageHydroxyprogesterone caproateSingleton spontaneous preterm birthEarly spontaneous preterm birthFirst-degree family historyPreterm birth preventionHigh-risk womenPlanned secondary analysisPredictors of responseChi-square testPenultimate pregnancyPregnancy characteristicsNeonatal morbidityPregnancy coursePreterm pregnanciesBirth preventionCurrent pregnancyRegression models
2008
Joint Modeling of Time Series Measures and Recurrent Events and Analysis of the Effects of Air Quality on Respiratory Symptoms
Zhang H, Ye Y, Diggle P, Shi J. Joint Modeling of Time Series Measures and Recurrent Events and Analysis of the Effects of Air Quality on Respiratory Symptoms. Journal Of The American Statistical Association 2008, 103: 48-60. DOI: 10.1198/016214507000000185.Peer-Reviewed Original ResearchRespiratory symptomsRunny noseInfant symptomsCough incidenceCough symptomsMothers' symptomsInfant Health StudyRespiratory symptom dataRecurrent eventsMixed effects regression modelsRisk factorsHealth StudySignificant associationSymptom dataSymptomsInfantsSensitive childrenMothersSulfate levelsRegression modelsSignificant effectRiskNoseAssociationHigh levels
2007
Perturbation selection and influence measures in local influence analysis
Zhu H, Ibrahim J, Lee S, Zhang H. Perturbation selection and influence measures in local influence analysis. The Annals Of Statistics 2007, 35: 2565-2588. DOI: 10.1214/009053607000000343.Peer-Reviewed Original ResearchInfluence measuresMetric tensorAssessing local influence of minor perturbationsLocal influence of minor perturbationsAssess local influenceLocal influence approachDifferential-geometrical frameworkAffine curvatureNormal curvatureInfluence approachMinor perturbationsPerturbation modelTensorPerturbationLinear mixed modelsLinear regression modelsCurvatureStatistical modelMixed modelsFunctionRegression models
2003
Hypothesis testing in mixture regression models
Zhu H, Zhang H. Hypothesis testing in mixture regression models. Journal Of The Royal Statistical Society Series B (Statistical Methodology) 2003, 66: 3-16. DOI: 10.1046/j.1369-7412.2003.05379.x.Peer-Reviewed Original ResearchMixture regression modelLikelihood estimatorTest statisticLog-likelihood ratio test statisticOptimal convergence ratesMaximum likelihoodRatio test statisticAsymptotic theoryReal data setsAsymptotic distributionConvergence rateTheoretical resultsEmpirical performanceReasonable conditionsSimulation studyHypothesis testingEstimatorStatisticsData setsRegression modelsModelTheoryDistribution