کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
417912 681591 2008 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Testing homogeneity of risk difference in stratified randomized trials with noncompliance
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر نظریه محاسباتی و ریاضیات
پیش نمایش صفحه اول مقاله
Testing homogeneity of risk difference in stratified randomized trials with noncompliance
چکیده انگلیسی

When assessing a treatment effect in the presence of confounders, we often employ stratified analysis and obtain a summary estimate of the risk difference (RD) under the assumption that the underlying RD is homogeneous across strata. In a randomized clinical trial (RCT), we may commonly come across the data in which there are patients who do not comply with their assigned treatments. Thus, to avoid reaching a misleading conclusion due to overlooking an interaction between treatments and strata, it is important that we can incorporate noncompliance into examining the homogeneity of the RD. In this paper, we develop four statistics for testing the homogeneity of the RD in a stratified RCT with noncompliance. These include the test statistic derived from the weighted-least-squares (WLS) method, the test statistic using the WLS method and tanh−1(x)tanh−1(x) transformation, the test statistic using the weight similar to the Mantel–Haenszel (MH) estimator, and the test statistic using an optimal weight and the MH point estimator. We apply Monte Carlo simulation to evaluate the performance of these test statistics with respect to Type I error and power in a variety of situations. We use the data taken from a multiple risk factors intervention trial and a numerical example of simulated data to illustrate the practical use of these test statistics. Finally, we do a sensitivity analysis and discuss why applying test statistics for the ITT analysis to test the homogeneity of RD as focused in this paper can lead us to make an incorrect inference.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational Statistics & Data Analysis - Volume 53, Issue 1, 15 September 2008, Pages 209–221
نویسندگان
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