ABSTRACT
To analyze the design created for fuel Neo, select “Analyze Mixture Design” as shown in Figure 9.12. Doing so opens the dialog box shown in Figure 9.13. Select “Sulfation” for “Responses” and click on “Terms”. This opens the dialog box shown in Figure 9.14. Choose “Quadratic” for “Include component terms for model” and choose the “Selected Terms” as shown in Figure 9.14. Click on “OK” and it takes you back to the dialog box shown in Figure 9.13. Click on “OK” and the output shown in Figure 9.15 is the result. Starting from the term with the highest P-value that is greater than 0.05, eliminate one term at a time from the analysis by repeating the above steps (beginning with what is shown in Figure 9.12). Figure 9.16 shows the elimination of the QR term from the analysis and Figure 9.17 shows the corresponding output. Figure 9.18 shows the elimination of the PR term (as well) from the analysis and Figure 9.19 shows the corresponding output. Figure 9.20 shows the elimination of the PQ term (as well) from the analysis and Figure 9.21 shows the corresponding output. Notice that the P-value (0.048) in Figure 9.21 is less than 0.05, and hence this model in Figure 9.21 can be considered now for optimization.
