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Marc Raimondo - CMI

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Summary (for Part II)<br />

T-W approximation to null distribution of Roy’s largest root:<br />

� Conventional percentiles: generally accurate to < 10%<br />

relative error<br />

� [Rough p−value assessments: qualitatively o.k. over many<br />

orders of magnitude]<br />

� Similar O(N −2/3 ) approximations for Wishart and Gaussian.<br />

Recommend: Tracy-Widom approximation replace F − lower<br />

bound in default package printouts<br />

Luminy 12/08 – p.28

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