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Bartlett

Bartlett's test: do several groups share one variance, assuming each is normal?

The same question Levene asks, under the stronger assumption — which buys power when it holds and costs correctness when it does not. Bartlett's statistic is sensitive to departures from normality in a way that looks like a difference in variance, so on data whose shape is unknown Levene is the safer reading, and that is why both ship.

Members

Member	What it does
Bartlett.Test	Compares the variances of two or more groups.