Compare proportion with a dichotomous outcome between two samples, using the Chi-squared statistic (or z test).
Instructions: Enter parameters in the red cells. Answer will appear in the blue cells.
Enter any ONE of the following three parameters (the other two will be calculated automatically):
The standard normal deviate for α = Zα = 0.000
The standard normal deviate for β = Zβ = 0.000
Pooled proportion = P = (q1*P1) + (q0*P0) = 0.000
A = Zα√P(1-P)(1/q1 + 1/q0) = 0.000
B = Zβ√P1(1-P1)(1/q1) + P0(1-P0)(1/q0) = 0.000
C = (P1-P0)2 = 0.000
Total group size = N = (A+B)2/C = 0
Continuity correction (added to N for Group 0) = CC = 1/(q1 * |P1-P0|) = 0
This calculator uses the normal distribution (with and without the continuity correction) as an approximation to the binomial distribution.
Hulley SB, Cummings SR, Browner WS, Grady D, Newman TB. Designing clinical research : an epidemiologic approach. 4th ed. Philadelphia, PA: Lippincott Williams & Wilkins; 2013. Appendix 6B, page 75.
(Continuity Correction) Fleiss JL, Tytun A, Ury HK. A simple approximation for calculating sample sizes for comparing independent proportions. Biometrics 1980;36:343-46.