R vs SAS - Sample size for superiority studies

Summary of R vs SAS Comparison for Sample size for superiority studies

For the superiority single timepoint analysis (both parallel group and cross-over design), functions available in R packages samplesize, stats, and pwr, and PROC POWER in SAS have been found to 100% agree.

Analysis	Supported in R	Supported in SAS	Results Match	Notes
Sample size for comparison of two means (Independent samples/ Parallel group)	Yes	Yes	Yes
Sample size for comparison of two means (Paired/Crossover)	Yes	Yes	Yes