Given the maximum available sample size (N) for an experiment, and the target levels of Type I and II error probabilities, this package designs a modified SPRT (MSPRT). For any designed MSPRT the package can also obtain its operating characteristics and implement the test for a given sequentially observed data. The MSPRT is defined in a manner very similar to Wald's initial proposal. The proposed test has shown evidence of reducing the average sample size required to perform statistical hypothesis tests at specified levels of significance and power. Currently, the package implements onesample proportion tests, one and twosample z tests, and one and twosample t tests. A brief user guidance for this package is provided below. One can also refer to the supplemental information for the same.
Package details 


Author  Sandipan Pramanik [aut, cre], Valen E. Johnson [aut], Anirban Bhattacharya [aut] 
Maintainer  Sandipan Pramanik <sandy.pramanik@gmail.com> 
License  GPL (>= 2) 
Version  3.0 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

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