Sample Size - Proportions

Instructions: Enter parameters in the Red cells. Answer will appear in the blue cells.

  • Q1 = proportion of subject in group 1 (exposed)
  • Q0 = proportion of subject in group 0 (unexposed)
  • P1 = Risk in Group 1
  • P0 = Risk in Group 0
Alpha (Two-tailed)BetaQ1Q0P1P0
1
Z-AlphaZ-BetaP
0.000.000.00
Numerator1Numerator2Denominator
0.000.00-0.10

WITHOUT THE CONTINUITY CORRECTION

Group 1Group 0Total
000
Outcome+000
Outcome-000

WITH THE CONTINUITY CORRECTION

Group 1Group 0Total
01919
Outcome+088
Outcome-01212

Software utilities by Michael Kohn (makohn@mkanders.com) and Mike Jarrett (mike.jarrett@quesgen.com)

Disclaimer: Software is provided on an as-is basis and no warranty is made of any kind. Calculations are believed accurate but should be verified by the user