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Sample Size Calculator
Visual Understanding of Sample Size Calculation for Common Epidemiological Studies
Select Study Design:
Prevalence Study (Cross-Sectional)
Case-Control Study
Cohort Study
Randomized Controlled Trial (RCT)
Comparing Two Means
Sample Size for ITT Studies
Superiority (Binary)
Superiority (Continuous)
Non-inferiority (Binary)
Non-inferiority (Continuous)
Equivalence (Binary)
Equivalence (Continuous)
Sample Size (N)
0
N = 4PQ / D²
P = 0.50 Q = 0.50 D = 0.05
Formula Steps
Interpretation