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# Equality of Variances (ANOVA)

There are two methods for comparing the equality of variances:

The output below is for the example being used in this section with all the factors being fixed factors and for comparing A*B. When comparing components with more than one factor, the program first generates a table of treatment combinations as shown below. Treatment 1 is A at level A1 and B at level B1. Treatment 2 is A at level A1 and B at level B2. The comparisons are then based on these treatments.

### Bartlett’s Test

Bartlett’s Test is used to determine if the treatment variances are the same. The output for this example is shown below for the A*B treatment combination.

The treatments are listed along with the count, the variance and standard deviation for each treatment. The following three statistics are given:

### Modified Levene’s Test

The Modified Levene Test is used to determine the equality of treatment variances.  The output for this example is shown below.

The treatment combination is listed along with the count, the variance and standard deviation. The following three statistics are given:

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