With the widespread availability of statistical software, concerns about its numerical accuracy are now greater than ever. Inevitably, numerical accuracy problems will affect some of this software despite extensive testing. In response to concerns of both the statistical community and industrial users, the statistics and mathematics groups at NIST have developed a web site that provides reference data sets for checking the numerical accuracy of computationsfor a variety of statistical methods. This service is called Statistical Reference Datasets (StRD). The StRD web pages are intended to complement the testing of statistical software by providing data sets and corresponding certified values of commonly-computed statistics for comparison with output from a user's software. This talk will describe