how to calculate power for stata what is the power for stata how to calculate the power of a randomised controlled trial what is the power of stata? how to calculate power with stata what is a standard deviation for stata how to calculate sample sizes in stata how to calculate the power of data using stata what is the power of statistics how to use stata as power analysis how to perform power analysis how to calculate power of a patient with stata what is the formula to perform a power analysis in stata statistical formula to determine the power what is power analysis in stata how to calculate power of data in stata how to find sample size in stata how to do a randomised power analysis what is the alpha value for power how to calculate the power of a statistic