nTerim 1.1.1 is free to download from our software library. The software is categorized as Business Tools. Our antivirus check shows that this download is safe. This tool was originally developed by Statistical Solutions Ltd.
From the developer:
Power and Sample Size for Group Sequential Trials. The main features of this product are: Power and Sample Size calculations for Two Means test, Two Proportions test and Log Rank test.
Choice of four alpha spending functions, O’Brien-Fleming, Pocock, Hwang-Shih-DeCani and Power as well as option to manually specify boundaries. Plots of boundary values. Plots of power vs sample size.
You may want to check out more software, such as nQuery Advisor + nTerim, which might be similar to nTerim.