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Statistical Experimental Design and Analysis<br />

Selecting the Number of Factors and the Design Matrix<br />

Figure 12-4. Cuboidal Representation of Two 3-factors Designs<br />

The black bullets indicate that the corners are effectively chosen. The first design is obtained by<br />

setting the argument DESIGN=FULL_FACT and the second by DESIGN=ORTHA_2_N. The<br />

last design is a balanced subset of the full factorial design.<br />

Note<br />

With DEX analysis based on Hadamard matrices, the main effects are, in general, heavily<br />

confounded (or aliased) with two-factor interactions. As such it may be difficult to handle<br />

large numbers of aliased effects and interpret their significance. The main effect analysis may<br />

not explain the variation in <strong>user</strong>-defined response very well.<br />

See Also<br />

• “.DEX” in the Eldo Reference Manual<br />

• “.EXTRACT” in the Eldo Reference Manual<br />

• “.MEAS” in the Eldo Reference Manual<br />

• “.PARAMDEX” in the Eldo Reference Manual<br />

Related Topics<br />

Designing a Screening Experiment<br />

Viewing the Experiment Results<br />

Example of Conducting an Experiment<br />

Eldo® User's Manual, 15.3 575

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