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Comparison of Proportions in Two Independent Samples
Using Pearson Chi-Square Test
Sample Size
Power
Calculate Sample Size
Desired Power
Value between 0.5 and 0.99
Proportion in Group 1 (p1)
Value between 0 and 1
Proportion in Group 2 (p2)
Value between 0 and 1
Sample Size Ratio (group2/group1)
Typically 1 for equal group sizes
Alpha
Typically 0.05 for 95% confidence
Test Type
Two-sided
One-sided
Calculate Sample Size
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Calculate Power
Proportion in Group 1 (p1)
Value between 0 and 1
Proportion in Group 2 (p2)
Value between 0 and 1
Sample Size in Group 1 (n1)
Positive integer
Sample Size in Group 2 (n2)
Positive integer
Alpha
Typically 0.05 for 95% confidence
Test Type
Two-sided
One-sided
Calculate Power
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