Statistical Software Package

Over a period of many years, the Hydrologic Engineering Center has supported a variety of statistical software that performs frequency analysis and other statistical computations. Four applications had been developed: HEC-FFA, HEC-STATS, REGFREQ and MLRP. This software was developed in the 80’s and early 90’s was DOS based and the time had come for its retirement. In 2007, HEC began an effort to combine and update this software into the Statistical Software package (HEC-SSP). Initially, version 1.0 performed the Bulletin 17B analysis. This incorporated the capabilities of HEC-FFA. Subsequently, volume-frequency and general frequency analyses capabilities in HEC-STATS were added. Currently, duration analysis and coincident frequency analysis are being designed and added to SSP. This presentation will detail the tools within the software, both existing and planned, and how they can help the hydrologist and engineer perform consistent statistical analyses critical to projects throughout the world.