Talk:Quadratic form (statistics)

If and they are not symmetric, the above formula contradicts the variance formula, since in that case . How to resolve this? Btyner 04:48, 3 April 2006 (UTC)Reply

Yikes, the expression was wrong in the case of nonsymmetric s. I have noted the symmetric requirement, and added a section showing how to derive the general expression. Btyner 18:24, 6 April 2006 (UTC)Reply

Is symmetry really necessary for the expectation result?

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Nothing in the usual proof of the result for expectation seems to require symmetry of  :

  =  
=  
=  
=  
=  

Geomon 23:30, 21 December 2006 (UTC)Reply

Good call. I must have been thinking about bilinear forms when I wrote that. Btyner 00:16, 23 January 2007 (UTC)Reply