Let X = X 1 ,,X n be independent and let the residuals X i

Question:

Let X = X 1

,…,X n

be independent and let the residuals X i − κ

i be identically distributed with cumulants κ2δ

ij

, κ3δ

ijk and so on. Find the mean and variance of the quadratic form aijX iX j and express the result in matrix notation (Seber, 1977, p. 9).

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