Two distributions that don't overlap at all have a d value of zero.

Name: Two distributions that don't overlap at all have a d value of zero.
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The d value, or Cohen's d, measures the effect size or the standardized difference between two means. A d value of zero indicates no difference between the means, not necessarily that the distributions don't overlap. Non-overlapping distributions would typically result in a large d value, indicating a significant difference between the groups.

Two Distributions That Don't Overlap at All Have a D