Multivariate Analysis Dr. Asmaa Ghalib Jabir

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Multivariate Analysis Dr. Asmaa Ghalib Jabir Lecture One Matrix Algebra Matrix Algebra The Matrix It is an ordered array of a set of observations as m rows and n columns, those observations are called: elements. A(( aij )) , where

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Multivariate Analysis Dr. Asmaa Ghalib Jabir<br>
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Lecture One Matrix Algebra<br>
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Matrix Algebra The Matrix
It is an ordered array of a set of observations as m "rows" and n "columns", those observations are called: "elements".
A=(( aij )) , where is: i=1,2,3,…, m and j=1,2,3,…, n.
Trace of a Matrix
The sum of elements on the main diagonal of a square matrix (A) is called the "trace" of a matrix. For (n×n) matrix (A),<br>