Dose-effect analysis plotted curves

The elasticity of a rocket propellant was measured as the system response. An analysis of Fig. 3.3 indicates that all three components of the composition have large effects and that the response surface is greatly curved or nonlinear. Besides, the greatest response values were obtained dose to the centroid. Large response values also occurred for lower Xi levels and for X3 values between 0.33 and 0.67. Graphic interpretation of the simplex screening experiment may be compared to the response surface contour plots of the same example, Fig. 3.4. 

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