A power approximation for the Kenward and Roger Wald test in the linear mixed model.
A power approximation for the Kenward and Roger Wald test in the linear mixed model.
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DOI:
10.1371/journal.pone.0254811
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发表时间:
2021
期刊:
影响因子:
3.7
通讯作者:
Glueck DH
中科院分区:
文献类型:
--
作者:
Kreidler SM;Ringham BM;Muller KE;Glueck DH
We derive a noncentral power approximation for the Kenward and Roger test. We use a method of moments approach to form an approximate distribution for the Kenward and Roger scaled Wald statistic, under the alternative. The result depends on the approximate moments of the unscaled Wald statistic. Via Monte Carlo simulation, we demonstrate that the new power approximation is accurate for cluster randomized trials and longitudinal study designs. The method retains accuracy for small sample sizes, even in the presence of missing data. We illustrate the method with a power calculation for an unbalanced group-randomized trial in oral cancer prevention.
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DOI:
10.1198/106186006x112954
发表时间:
2006-06-01
影响因子:
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