2011
Statistical Inference in Mixed Models and Analysis of Twin and Family Data
Wang X, Guo X, He M, Zhang H. Statistical Inference in Mixed Models and Analysis of Twin and Family Data. Biometrics 2011, 67: 987-995. PMID: 21306354, PMCID: PMC3129472, DOI: 10.1111/j.1541-0420.2010.01548.x.Peer-Reviewed Original ResearchConceptsStandard regularity conditionsStatistical inferenceAsymptotic distributionRegularity conditionsSufficient conditionsCholesky decompositionLikelihood ratio testComputational softwareLinear modelAdvanced theoryFamily data analysisImportant exampleRatio testFamily dataKey ideaPrecise estimatesMixed-effects modelsTheoryMixed effects modelsData setsIdentifiabilityModelEstimatesMixed modelsGeneral linear model
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
2006
The Dose Effect of a Group Intervention for Bereaved HIV-Positive Individuals
Ghebremichael M, Hansen N, Zhang H, Sikkema K. The Dose Effect of a Group Intervention for Bereaved HIV-Positive Individuals. Group Dynamics Theory Research And Practice 2006, 10: 167-180. DOI: 10.1037/1089-2699.10.3.167.Peer-Reviewed Original ResearchGroup interventionPsychiatric distressHIV-positive womenHIV-positive individualsQuestion of dosageHIV infectionClinical significanceHealth-related issuesIntervention exposureDose effectInterventionDistressLongitudinal effectsDosageMixed modelsLongitudinal data analysisPostinterventionCancerInfectionGriefAIDSDosesBaselineWomen