Slide 1: Minitab 12 Flow Charts • Factorial Designs – Creating a design – Analyzing a design • Response Surface Designs – Creating a design – Importing other Designs – Analyzing a design – Single response Optimization – Multiple response Optimization • Calculating Transformations
Slide 2: Factorial Designs Overview Set up the Experimental Question & Design Decide how many factors, what levels, type of design Create the design Run the Experiment Run model Diagnostic plots Refine model/transform? Yes No Check for important factors Next experiment
Slide 3: Creating Factorial Designs - Page 1 Set up the Experimental Question & Design Decide how many factors, what levels, type of design Open Minitab From the Stat Menu, choose DOE → Create Factorial Design Choose the Number of Factors Choose the Designs Button
Slide 4: Creating Factorial Designs - Page 2 Select the specific design from the top window Choose: the Number of center points (if any) the Number of replicates (if any) the Number of blocks (if any) Choose OK
Slide 5: Creating Factorial Designs - Page 3 Choose the Factors Button Fill in the Factors and their values Choose OK Choose OK The design is created in the worksheet
Slide 6: Analyzing Factorial Designs - Page 1 Open the Project in Minitab From the Stat Menu, Choose DOE → Analyze Factorial Design Choose the response Choose the Graphs Button Choose Pareto Plot Choose OK
Slide 7: Analyzing Factorial Designs - Page 2 If the design is replicated or a reduced model is being fitted, under Residual Plots, choose: Standardized Residuals Normal Plot Residuals versus fits Residuals versus order Choose OK If fitting a reduced model, choose Terms and select model terms using the > button
Slide 8: Analyzing Factorial Designs - Page 3 Choose OK Check diagnostics: Does the Normal Plot look like a straight line? Residuals versus fits look random? Residuals versus order look random? If not, try adding/removing model terms or a transformation of the data Pareto Plot: Can you distinguish important factors from the unimportant?
Slide 9: Analyzing Factorial Designs - Page 4 From the Stat menu, choose: DOE → Factorial Plots Choose Main Effects and Interaction Plots For each plot choose Setup and: Select the response Select all the factors with the >> button Select OK when done Determine important factors and/or interactions
Slide 10: Calculating Transformations From the Calc menu, choose: Calculator Choose a name for the Store result in variable space Under Expression, create the function by using the calculator buttons (+,-…) or the functions listed in the Functions box Columns from the current worksheet are given on the left