Sensitivity Analysis Around a Point

Estimates of responses to a single combination of variables do not tell the whole story. Often the formulation projected by the optimizer corresponds to the absolutely highest point of what may be a very wide plane of virtually equally acceptable optima. Furthermore, changes in one physical variable may not change ratings, whereas changes in another variable may dramatically change ratings.

Sensitivity analysis estimates effects due to one variable, with all other variables held constant. For changes in one independent variable the investigator estimates the attribute profile using the equations.

Table 21 shows the sensitivity analysis. The table shows how the dependent variable covaries with the independent variable.

Using the Product Model to Assure Quality

The product model relates independent attributes (under research or production control) to dependent variables, be

Table 21. Sensitivity Analysis (From midpoint)
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