The Bartlett test is used to test whether the variances of groups to be compared are equal (homoscedasticity, or homogeneity of variances). Some statistical test such as ANOVA assume equal variances. The Bartlett test can be used to verify that assumption.
The Bartlett Test configuration window is illustrated below.
Up to four groups can be compared, according to the Type selection
If Merge columns is enabled, the data of all columns will be pooled, otherwise the test is performed between the respective columns of the aggregates.
With the One aggregate - columns as groups setting it is assumed that the groups to be compared are arranged as columns in a single aggregate.
The script produces a result table (bartlett_result) listing the p-value for each aggregate column and indicating its significance.