Design-Expert 5.0 Reference Manual - Statease.info

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Examine Model Graphs Normal Probability Plot of the Residuals The diagnosis of residuals reveals no statistical problems, so you will now generate the response surface plots. Click on the Model Graphs button. The 2D contour plot of factors A versus B comes up by default. Response Surface Plotting Range with Defaults 6-16 • Response Surface Method (RSM) Tutorials Design-Expert 6 User’s Guide
Rev. 3/12/01 Note that Design-Expert will display any actual point included in the design space shown. In this case you see a plot of conversion as a function of time and temperature at a mid-level slice of catalyst. This slice includes six centerpoints as indicated by the dot at the middle of the contour plot. By replicating center points, you get a very good power of prediction at the middle of your experimental region. The Factors Tool comes along with the default plot. Move this floating tool as needed by clicking on the top blue border and dragging it. The tool controls which factor(s) are plotted on the graph. The Gauges view is the default. Each factor listed will either have an axis label, indicating that it is currently shown on the graph, or a red slider bar, which allows you to choose specific settings for the factors that are not currently plotted. The red slider bars will default to the midpoint levels of the factors not currently assigned to axes. You can change a factor level by dragging the red slider bars or by right clicking on a factor name to make it active (it becomes highlighted) and then typing the desired level in the numeric space near the bottom of the tool palette. Click on the C:catalyst toolbar to see its value. Don’t worry if it shifts a bit – we will instruct you on how to reset it in a moment. Factors Tool with Factor C Highlighted and Value Displayed Switch to the Sheet View by clicking on the Sheet button. Factors Tool Palette –Sheet View In the columns labeled Axis and Value you can change the axes settings or type in specific values for factors. If the catalyst value shifted from its mid-point value of 2.50, correct it now. Then return to the default view by clicking on the Gauges button. Design-Expert 6 User’s Guide Response Surface Method (RSM) Tutorials • 6-17
Page 1 and 2: Section 6 - Response Surface Method
Page 3 and 4: Rev. 3/12/01 The default selection
Page 5 and 6: Save the Data to a File Completed D
Page 7 and 8: Analyze the Results Design Layout w
Page 9 and 10: Graph of Factor A: Time versus Resp
Page 11 and 12: Rev. 3/12/01 For each source of ter
Page 13 and 14: Rev. 3/12/01 statistical details ne
Page 15: Rev. 3/12/01 Finally, by scrolling
Page 19 and 20: Contour Plot Rev. 3/12/01 Let’s l
Page 21 and 22: Rev. 3/12/01 Right clicking on a co
Page 23 and 24: Standard Error Plot Rev. 3/12/01 Th
Page 25 and 26: Response Prediction Rev. 3/12/01 No
Page 27 and 28: Design Status Screen Numerical Opti
Page 29 and 30: Rev. 3/12/01 Now click on the secon
Page 31 and 32: Rev. 3/12/01 The program randomly p
Page 33 and 34: Rev. 3/12/01 Design-Expert software
Page 35 and 36: Rev. 3/12/01 Notice that the softwa
Page 37 and 38: Rev. 3/12/01 Click on the solutions
Page 39 and 40: Overlay Plot Rev. 3/12/01 To match
Page 41: Final Comments Rev. 3/12/01 We feel

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