#GROUP SEQUENTIAL TESTING TRIAL#

Statistical powers of the proposed group sequential test are also presented. The results indicate that the type I error rate of the proposed test procedure is well preserved, while the type I error rate of the standard group sequential test is inflated as the population changes. In order to apply group sequential methods for interim analysis for early stopping in clinical trials, the joint distribution of test statistics. A simulation was performed to evaluate the performance of the proposed method. optimized group sequential study designs to the analysis of genetic linkage (one-sided mean test) and association. (1943, 1945, 1947), wherein a statistical test is performed after each. A new group sequential test procedure that accounts for the effect of population changes is proposed. The genesis of interim analyses starts with fully sequential tests introduced by Wald. Under this model, we can make inference on the original target population based on additional data from the changed populations.

#GROUP SEQUENTIAL TESTING TRIAL#

In this paper, we consider changes in patient population related to some covariates of an on-going trial through a linear regression model. As a result, the original patient population may have changed to a similar but different patient population. Testing and estimation in exible group sequential designs. In practice, however, this assumption is often not met because the trial may be modified after the review of the clinical data at interim. The aim of this study is comparing group sequential tests in respect to advantage of sample size reduction and early termination. Published online in Wiley InterScience (DOI: 10.1002/sim.2389. The standard group sequential test is statistically valid under the assumption that the patient population remains unchanged from one interim analysis to another. Several authors have proposed group sequential procedures to satisfy the ethicalneed in clinical trials for interim analyses. In clinical trials, a standard group sequential test with a fixed number of planned interim analyses is usually considered to assess the effect of a test treatment under study.

Group sequential testing