how much is the sample in statistics what is the difference between r and stata r vs stata sample size why the variances between r and stata r vs stata r test results difference between r and stata how to figure out sample n difference between r and stata r statistic sample size r vs stata results what is the difference between stata and r what is the difference between r and stata r vs stata sample size estimate sample size comparison stata vs r difference between r and stata r compare sample size for stata how to determine sample size r or stata how does r compare to stata r vs stata compare sample size what is the difference between r and stata