Mixture Experiments in Minitab
 

The design and subsequent analysis of a mixture experiment might consist of the following steps:

1    Choose a mixture design for the experiment. Before you begin using Minitab, you need to determine what design is appropriate for your problem. See Choosing a Design.

2    Use Create Mixture Design to generate a simplex centroid, simplex lattice, or extreme vertices mixture design. In addition, you can include amounts or process variables in your design to create mixture-amounts designs and mixture-process variable designs.

Use Define Custom Mixture Design to create a design from data you already have in the worksheet. Define Custom Mixture Design allows you to specify which columns contain your components and other design characteristics. You can then easily fit a model to the design.

3    Use Modify Design to rename the components, replicate the design, randomize the design, and renumber the design.

4    Use Display Design to change the display order of the runs and to change the units in which Minitab expresses the components or process variables in the worksheet.

5    Perform the mixture experiment and collect the response data. Then, enter the data in your Minitab worksheet. See Collecting and Entering Data.

6    Use Analyze Mixture Design to fit a model to the experimental data.

7    Use plots to visualize the design space or response surface patterns. Use Simplex Design Plot to view the design space, or Response Trace Plot and Contour/Surface Plots to visualize response surface patterns.

8    If you are trying to optimize responses, use Response Optimizer or Overlaid Contour Plot to obtain a numerical and graphical analysis.

Depending on your experiment, you may do some of the steps in a different order, perform a given step more than once, or eliminate a step.

 

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