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On the Distribution of a Quadratic Form

D. N. Shanbhag
Biometrika
Vol. 57, No. 1 (Apr., 1970), pp. 222-223
Published by: Oxford University Press on behalf of Biometrika Trust
DOI: 10.2307/2334959
Stable URL: http://www.jstor.org/stable/2334959
Page Count: 2
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Abstract

This note improves a necessary and sufficient condition given by Good (1969) for a quadratic form X'AX, where X has a multinormal distribution with mean vector O, to have a χ2 distribution with r degrees of freedom.

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