The classical twosample ttest works well for the normally distributed data or data with large sample size. The tcfu() and tt() tests implemented in this package provide better typeIerror control with more accurate power when testing the equality of twosample means for skewed populations having unequal variances. These tests are especially useful when the sample sizes are moderate. The tcfu() uses the CornishFisher expansion to achieve a better approximation to the true percentiles. The tt() provides transformations of the Welch's tstatistic so that the sampling distribution become more symmetric. For more technical details, please refer to Zhang (2019) <http://hdl.handle.net/2097/40235>.
Package details 


Author  Huaiyu Zhang, Haiyan Wang 
Maintainer  Huaiyu Zhang <huaiyuzhang1988@gmail.com> 
License  GPL2 
Version  0.1.0 
Package repository  View on CRAN 
Installation 
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