Calculate Sample Size Needed to :

Formulas

This calculator uses the following formulas to compute sample size and power, respectively: where

• $n$ is sample size
• $\Phi$ is the standard Normal distribution function
• $\Phi^{-1}$ is the standard Normal quantile function
• $\alpha$ is Type I error
• $\beta$ is Type II error, meaning $1-\beta$ is power

R Code

R code to implement these functions:

References

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