Overview for Define Custom 2-Level Factorial Design

Use Define Custom 2-Level Factorial Design to define a design from data you already have in the worksheet.

Usually, you define a custom design for one of the following reasons:
  • You created a design in Minitab and modified the worksheet so that Minitab could no longer analyze the design. For example, Minitab cannot analyze the design if you move or delete the column that contains the standard order of the design.
  • You typed the design information directly into the worksheet.
  • You imported the design from a non-Minitab file.
  • You created the design using Minitab Session commands.
  • You created the design with a version of Minitab older than version 13.

For example, an engineer has a 2-level fractional factorial design in a Microsoft Excel spreadsheet. The engineer wants to fold the design to reduce the aliasing. The engineer opens the worksheet in Minitab. Then, the engineer defines the design as a custom 2-level factorial design and uses Minitab to fold the design.

Where to find this analysis

Stat > DOE > Factorial > Define Custom Factorial Design

When to use an alternate analysis

  • If the design includes a hard-to-change factor, define a 2-level split-plot design.
  • If some of the factors have more than 2 levels, not counting center point runs, then define a general full factorial design.
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