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Modeling and Multivariate Methods - SAS

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Chapter 24 Visualizing, Optimizing, <strong>and</strong> Simulating Response Surfaces 571<br />

Special Profiler Topics<br />

Figure 24.18 Profiler After Optimization<br />

Special Profiler Topics<br />

Propagation of Error Bars<br />

Propagation of error (POE) is important when attributing the variation of the response in terms of variation<br />

in the factor values when the factor values are not very controllable.<br />

In JMP’s implementation, the Profiler first looks at the factor <strong>and</strong> response variables to see if there is a<br />

Sigma column property (a specification for the st<strong>and</strong>ard deviation of the column, accessed through the<br />

Cols > Column Info dialog box). If the property exists, then the Prop of Error Bars comm<strong>and</strong> becomes<br />

accessible in the Prediction Profiler drop-down menu. This displays the 3σ interval that is implied on the<br />

response due to the variation in the factor.

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