Phi Coefficient Calculator
Calculate the correlation between two binary variables
Enter the counts for a 2x2 contingency table.
Variable 2: Yes
Variable 2: No
Variable 1: Yes
Variable 1: No
About Phi Coefficient
Phi (Ο) measures association between two binary variables.
Formula: Ο = (ad - bc) / β(r1 Γ r2 Γ c1 Γ c2)
Range: -1 to +1 (like Pearson's r)
Relationship: ΟΒ² = ΟΒ² Γ n
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