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Statistical Experimental Design and Analysis<br />

Defining the Levels of Factors for the DEX Analysis<br />

When h is specified as a percentage:<br />

Defining Levels as a Fraction of the Standard Deviation<br />

You can specify the levels as a fraction of the standard deviation σ defined on noise parameters<br />

that are associated with the normal or uniform distribution. The values of the low level xlow and<br />

high level x high are defined as ±n·σ.<br />

This situation is depicted in Figure 12-3, with factor levels x low and x high for parameter x.<br />

Figure 12-3. Factor Levels for a Circuit Parameter x<br />

The syntax for this is defined as:<br />

.PARAMDEX FACTOR_NAME [NOISE/] SIG=NSIGMA<br />

568<br />

Eldo® User's Manual, 15.3

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