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Sample Size Calculator
Study Type:
One Sample Mean
Two Sample Means
One Sample Proportion
Two Sample Proportions
Survival Analysis
Superiority Study
Inferiority Study
Equivalency Study
Hazard Ratio
Relative Risk
Odds Ratio
Confidence Level (%):
90%
95%
99%
Power (%):
80%
85%
90%
95%
Alpha (Type I Error):
Beta (Type II Error):
Mean 1:
Mean 2:
Standard Deviation:
Proportion 1 (%):
Proportion 2 (%):
Effect Size:
Survival Method:
Hazard Ratio
Median Survival Times
Event Rates
Expected Hazard Ratio:
Control Median Survival (months):
Accrual Time (months):
Follow-up Time (months):
Control Median Survival (months):
Treatment Median Survival (months):
Follow-up Time (months):
Control Event Rate (%):
Treatment Event Rate (%):
Follow-up Time (years):
Expected Ratio:
Control Group Rate (%):
Margin:
Allocation Ratio (Treatment:Control):
1:1
1.5:1
2:1
3:1
Calculate Sample Size
Required Sample Size
Formula & Assumptions
Formula:
Statistical Test:
Key Assumptions:
Parameters Used in Calculation:
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