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To test for interaction between Variety and Spacing, the contrast matrix is:

$\displaystyle {\bf C} = \left[ \begin{array}{rrrrrrrrrrrrrrrrrrrr} 0 & 0 & 0 & ... ...& 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 \end{array} \right]$    


Frank Starmer 2004-05-19
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