2021
swdpwr: A SAS macro and an R package for power calculations in stepped wedge cluster randomized trials
Chen J, Zhou X, Li F, Spiegelman D. swdpwr: A SAS macro and an R package for power calculations in stepped wedge cluster randomized trials. Computer Methods And Programs In Biomedicine 2021, 213: 106522. PMID: 34818620, PMCID: PMC8665077, DOI: 10.1016/j.cmpb.2021.106522.Peer-Reviewed Original ResearchConceptsWedge clusterIntracluster correlation coefficientContinuous outcomesCross-sectional cohortBinary outcomesExchangeable correlation structureWedge designPublic health intervention evaluationsHealth services researchClosed cohort designPower calculationCohort designClosed cohortStudy designIntracluster correlationIntervention evaluationNeeds of investigatorsOutcomesTrialsCohortServices researchInvestigatorsPrevious studiesSWD
2013
Testing for a Changepoint in the Cox Survival Regression Model
Zucker D, Agami S, Spiegelman D. Testing for a Changepoint in the Cox Survival Regression Model. Journal Of Statistical Theory And Practice 2013, 7: 360-380. DOI: 10.1080/15598608.2013.772030.Peer-Reviewed Original ResearchMaximum efficiency robust testCovariate domainSupremum-type testsTest statisticEfficiency robust testSupremum statisticsFirst author's websiteNurses' Health StudyCox survival regression modelType statisticsPower calculationCovariate effectsAuthor's websiteSimulation studySurvival regression modelsLinear combination formStandard Cox modelBest overall choicePopular modelsSimulation resultsFatal myocardial infarctionCox regression modelMATLAB softwareStatisticsRobust test