Mixture Design Tutorials - Statease.info

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already in the “Model Summary Statistics” table. It’s now safe to look at the coefficients and associated confidence intervals for the quadratic model. Scroll down to see these statistics. Post-ANOVA - Coefficients for the Quadratic Model The standard error given is the standard deviation associated with the coefficient estimates. This is used along with a t-value to generate a 95% confidence interval on each coefficient. The interval should bracket the true coefficient 95% of the time. Scroll down further to the next section of the output, which shows the predictive models in terms of pseudo (coded), real (coded) and actual components. Final Equation in Terms of Pseudo versus Real (Coded) Components Final Equation in Terms of Actual Components Design-Expert now uses the equations to make a list of actual versus predicted response values. These can be seen by scrolling down to the last part of this output screen - the “Diagnostics” table. 7-14 • Mixture Design Tutorials Design-Expert 6 User’s Guide
Review Diagnostic Graphs Diagnostics Case Statistics (partially shown) Rev. 5/10/02 The main thing to check in this table is the column labeled “Outlier t.” The program flags any values that fall outside of plus or minus 3.5. These unusual runs should be investigated for possible special causes. You might find something as simple as a transposition in data entry, or it could be something more dramatic, or you may find no special cause at all. Depending on your findings, you can decide to keep it in the data set, delete it, or right-click the button next to the suspect run and select Toggle Ignore Status. Other problems in the analysis will become more evident in plots of these statistics. You will do this in a moment. Before moving on, you may want to print these tables by doing a File, Print. Click on the Diagnostics button to open a palette of diagnostic tools. Normal Probability Plot of Studentized Residuals Design-Expert 6 User’s Guide Mixture Design Tutorials • 7-15
Page 1 and 2: Section 7 - Mixture Design Tutorial
Page 3 and 4: Rev. 5/10/02 and High fields, press
Page 5 and 6: Save the Data to a File Rev. 5/10/0
Page 7 and 8: Edit the Design Notice that the rea
Page 9 and 10: Analyze the Results Rev. 5/10/02 Op
Page 11 and 12: Rev. 5/10/02 You may need to widen
Page 13: Rev. 5/10/02 At this stage you coul
Page 17 and 18: Trace Plot Contour Plots Select Vie
Page 19 and 20: Incremental Option for Contour Leve
Page 21 and 22: Standard Error Plot Rev. 5/10/02 No
Page 23 and 24: Analyze the Data for the Second Res
Page 25 and 26: Numerical Optimization Rev. 5/10/02
Page 27 and 28: These settings create the following
Page 29 and 30: shown. Likewise, moving the bar to
Page 31 and 32: Rev. 5/10/02 you view the 3D surfac
Page 33 and 34: Rev. 5/10/02 The high resolution ma
Page 35 and 36: Rev. 5/10/02 Select POE (Turbidity)
Page 37 and 38: Setting Criteria for Graphical Opti

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