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 March 19th, 2016, 03:28 AM #1 Member   Joined: Sep 2013 Posts: 67 Thanks: 0 Matrix notation usinging the matrix notation Y=$\displaystyle \beta$X+u and knowing that x is an n x k matrix can you write the x matrix as this? $\displaystyle \left( {\begin{array}{*{20}{c}} {{x_{11}}}& \ldots &{{x_{1k}}}\\ \vdots & \ddots & \vdots \\ {{x_{n1}}}& \cdots &{{x_{nk}}} \end{array}} \right)$
 March 24th, 2016, 08:45 AM #2 Math Team   Joined: Jan 2015 From: Alabama Posts: 2,220 Thanks: 555 Yes, it can.

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