What Does X'X Represent in Linear Algebra?

RufusDawes · Oct 29, 2012

What does X'X mean ?

RufusDawes · Oct 29, 2012

Apparently it has something to do with a matrix.

MarneMath · Oct 29, 2012

Last time I saw that it was regarding deviation a sums of squares and cross product matrix. http://stattrek.com/matrix-algebra/sums-of-squares.aspx For more fun.

RufusDawes · Oct 29, 2012

MarneMath said:

Last time I saw that it was regarding deviation a sums of squares and cross product matrix. http://stattrek.com/matrix-algebra/sums-of-squares.aspx For more fun.

Cheers.

hotvette · Oct 29, 2012

In linear algebra, ' is often used to indicate Transpose. So X'X = X^TX.

What Does X'X Represent in Linear Algebra?

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