The Power and Sample Size Application (PSS) is an interface that provides power and sample size computations . The application includes tasks for determining sample size and power for a variety of statistical analyses, including t -tests, ANOVA, proportions , equivalence testing, linear models, survival analysis, and table statistics. The application provides multiple input parameter options, stores results in a project format, displays power curves, and produces appropriate narratives for the results. Note that this application is included with SAS/STAT software but needs to be installed from the Mid Tier CD.