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stat.ME2025
Factors affecting power in stepped wedge trials when the treatment effect varies with time
Avi Kenny, Emily C. Voldal, Fan Xia +3
Stepped wedge cluster randomized trials (SW-CRTs) have historically been analyzed using immediate treatment (IT) models, which assume the effect of the treatment is immediate after…
stat.ME2020
Defining and Estimating Subgroup Mediation Effects with Semi-Competing Risks Data
Fei Gao, Fan Xia, Kwun Chuen Gary Chan
In many medical studies, an ultimate failure event such as death is likely to be affected by the occurrence and timing of other intermediate clinical events. Both event times are s…