Johnstone Iain M
Department of Statistics, Stanford University, Stanford, California 94305, USA.
Ann Appl Stat. 2009;3(4):1616-1633. doi: 10.1214/08-AOAS220.
The greatest root distribution occurs everywhere in classical multivariate analysis, but even under the null hypothesis the exact distribution has required extensive tables or special purpose software. We describe a simple approximation, based on the Tracy-Widom distribution, that in many cases can be used instead of tables or software, at least for initial screening. The quality of approximation is studied, and its use illustrated in a variety of setttings.
最大根分布在经典多元分析的各个方面都有出现,但即使在原假设下,精确分布也需要大量的表格或专用软件。我们描述了一种基于特雷西 - 威多姆分布的简单近似方法,在许多情况下,至少用于初步筛选时,可以替代表格或软件。我们研究了近似的质量,并在各种情况下说明了其用法。