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Design of Experiments - US Army Conference on Applied Statistics

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Categorical Factor Coding – 3 levels<br />

Names<br />

Numeric<br />

Label<br />

Orthog<strong>on</strong>al<br />

Coding<br />

X 1 X 2<br />

Effects<br />

Coding<br />

Orthog<strong>on</strong>al Coding:<br />

There are two “dummy” columns – 2 degrees <str<strong>on</strong>g>of</str<strong>on</strong>g> freedom<br />

The sum <str<strong>on</strong>g>of</str<strong>on</strong>g> squares <str<strong>on</strong>g>of</str<strong>on</strong>g> both columns is 3.<br />

The sum <str<strong>on</strong>g>of</str<strong>on</strong>g> the element wise products is zero<br />

(i.e. the dot product is zero)<br />

or<br />

X 1 X 2

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