Power and Sample Size for 2-Level Factorial Design
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Stat > Power and Sample Size >2-Level Factorial Design

Use to calculate one of the following for two-level full and fractional factorial designs:

·    number of replicates

·    minimum effect

·    power

·    number of center points

You need to determine what are acceptable values for any three of these parameters and Minitab will solve for the fourth.

For example, if you specify values for power, minimum effect, and number of center points, Minitab will determine the number of replicates required to detect the specified effect at the specified level of power.

To calculate power or replicates for fractional designs, you need to specify the appropriate number of corner points for the number of factors. Use the information provided in Summary of Two-Level Designs to determine the correct number of corner points for these fractional designs.

Dialog box items

Number of factors: Enter the number of factors (input variables).

Number of corner points: Enter the number of corner points.

Specify values for any three of the following: Specify three values and Minitab will calculate the fourth.

Replicates: Enter one or more numbers of replicates.

Effects: Enter the effect(s).

Power values: Enter one or more power values.

Number of center points per block: Enter one or more values for the number of center points.

Standard deviation: Enter an estimate of the experimental variability (s) for your data. See Estimating standard deviation.

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