Design of Experiments Guide • Taguchi Designs • Creating a Taguchi Design
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Creating a Taguchi Design
To start a Taguchi design, select DOE >Taguchi Arrays, or click the Taguchi Arrays button on the JMP Starter DOE page. Then, follow the steps below:
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Detail the Response and Add Factors
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Choose Inner and Outer Array Designs
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Display Coded Design
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Make the Design Table
Detail the Response and Add Factors
The Responses panel has a single default response. The steps for setting up the details of this response are outlined in Setting Up the Response. For information on importance weights and lower and upper limits, see Understanding Importance Weights in Screening Designs.
1.
Double-click to edit the response name.
2.
Click to change the response goal: Larger Is Better, Nominal is Best, Smaller is Better, or None.
3.
Click to enter lower and upper limits and importance weights.
Setting Up the Response
Add factors in the Factors outline.
Signal
Specify one or more 2- or 3-level signal factors. Signal factors are system control inputs. These are factors that you can control in production.
Noise
Specify one or more noise factors. Noise factors are variables that are difficult or expensive to control in production. However, you must be able to control noise factors during the experiment.
Remove
Removes the selected factors.
The steps for specifying factors are given in Entering Factors.
1.
Click to add a signal, then select a signal type: 2 Level, or 3 Level.
Or click to add a noise.
2.
Double-click to edit the factor name.
3.
To change the value of a signal or noise, click and then type the new value.
Entering Factors
When you finish adding factors, click Continue.
Choose Inner and Outer Array Designs
Your choice for inner and outer arrays depends on the number and type of factors you have. Selecting a Design for Eight Signal Factors shows the available inner array choices when you have eight signal factors. If you also have noise factors, choices include designs for the outer array. To follow along, enter eight two-level Signal factors and click Continue. Then highlight the design you want and again click Continue. This example uses the L12 design.
Selecting a Design for Eight Signal Factors
If you did not specify a noise factor, after you click Continue, a dialog appears that asks you to specify how many times you want to perform each inner array run. Specify two (2) for this example.
Display Coded Design
After you select a design type, the Coded Design (Coding for Eight Factor L12 Design) is shown below the Factors panel.
Coding for Eight Factor L12 Design
The Coded Design shows the pattern of high and low values for the factors in each run. For more details on the coded design, see Understanding Design Codes in Screening Designs.
Make the Design Table
When you click Make Table, a table similar to that shown in Taguchi Design Table for Eight Factor L12 Design appears. In the data table, each row represents a run. In the values for the Pattern variable, plus signs designate high levels and minus signs represent low levels.
Taguchi Design Table for Eight Factor L12 Design