Show that the cross-product terms formed from (i· ··), (·j ··), and (ij i· ·j + X··)
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And sum each term in the inner summation, as grouped here, to get zero.
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i=1 j=1 j-1
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Related Book For
Probability and Statistical Inference
ISBN: 978-0321923271
9th edition
Authors: Robert V. Hogg, Elliot Tanis, Dale Zimmerman
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