摘要(英) |
The purpose of this study is to calculate the sample sizes for different allocation to three treatment groups in a three-arm non-inferiority trial. The aim is to determine the optimal sample size for each allocation and assess whether the achieved power meets our predefined target. The three-arm non-inferiority trial consists of an experimental group, a control group, and a placebo group, also known as a gold standard trial. It is designed for right-censored survival data, considering administrative censoring and lost to follow-up. The semiparametric models employed in this study include the Cox proportional hazards model, the accelerated failure time model, and the proportional odds model, which are compared under the same conditions. The three treatment groups are treated as covariates, and the models are used to estimate the coefficients, providing insights into the differences in treatment effects among the groups. The sample sizes and desired power are calculated based on the distribution of a large sample. Finally, the developed methodology is applied to a study on bladder cancer recurrence. |
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