Enter your data for Power and Sample Size for One-Way ANOVA

Stat > Power and Sample Size > One-Way ANOVA
  1. In Number of levels, enter the number of different values or categories that your factor has. For example, if the factor Shift has 3 settings (Morning, Day, Night), the number of levels is 3.
  2. Specify values for two of the following power function variables. Leave the variable that you want to calculate blank.
    Tip

    If you enter multiple values into a field, separate the values with a space. You can also use shorthand notation to indicate multiple values. For example, you can enter 10:40/5 to indicate sample sizes from 10 to 40 in increments of 5.

    • Sample sizes: Enter one or more values to specify the samples sizes that you want to assess. The value that you enter applies to each factor level. For example, if you plan to collect 50 observations for each factor level, enter 50. To assess the effect of different sample sizes, enter multiple values. Larger sample sizes give the test more power to detect a difference.
    • Values of the maximum difference between means: Enter one or more values to specify the mean difference that you want to detect between the factor level that has the smallest mean and the factor level that has the largest mean. Typically, you enter the smallest difference that has practical consequences for your application. For example, enter 5 if this mean difference is important to detect, but differences smaller than 5 are less important.
    • Power values: Enter one or more values to specify the probability that the test detects the difference when such a difference actually exists between the populations. Common values are 0.8 and 0.9. For example, enter 0.9 because for a 90% chance that the test will detect a practically important difference.
  3. In Standard deviation, enter a planning estimate of the pooled standard deviation. Usually, the estimate is from historical data, a pilot study, or process knowledge.
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