当数据不满足球面性时,即存在违反球形假设的情况,我们就需要对F统计量的自由度进行修正。此时,最常用的修正方法就是Greenhouse-Geisser校正。同时,需要注意的是,如果经过计算得到的estimated epsilon (ε)大于0.75时,则需使用Huynd-Feldt correction来进行校正。©...
2010The Greenhouse-Geisser CorrectionHerv´ e Abdi1 Overview and backgroundWhen performing an analysis of variance with a one factor repeatedmeasurement design, the effect of the independent variable is testedby computing an F statistic which is computed as the ratio of the ofmean square of ...
违反了球形检验,除了用上述的Greenhouse-Geisser,还可以使用Huynd-Feldt Correction As with the Greenhouse-Geisser correction, the Huynd-Feldt correction estimates epsilon (represented as ) in order to correct the degrees of freedom of theF-distribution as shown below: Using our prior example, and if ...
2.1 Greenhouse-Geisser correction Box’s approach works for the population covariance matrix, but, un- fortunately, in general this matrix is not known. In order to estimate ε we need to transform the sample covariance matrix into an esti- mate of the population covariance matrix. In order to...
In Neil Salkind (Ed.),Encyclopedia of Research Design. Thousand Oaks, CA: Sage. 2010 The Greenhouse-Geisser Correction Herv′e Abdi 1 Overview and background When performing an analysis of variance with a one factor repeated measurement design, the e?ect of the independent variable is tested ...
Doctor, why are you driving a wedge between us? Calculating sample size in multiple testing and the need for Geisser-Greenhouse correctionArticleThe evolution of the practices employed in a specialty is driven by different arrays of influences encompassing, among others, traditions, dogma, ...
Since the Geisser-Greenhouse correction has been shown to be a practical and effective adjustment procedure it seems reasonable that it also may be a good measure of the effect of correlation structure on the analysis. The first order autocorrelation dispersion structure may be appropriate for many ...