Welcome to Statistics and Operations Research
SAS has long developed software for data analysis, econometrics, operations research, and quality improvement.
The purpose of these pages is to provide our users with technical information about using this software, including details about software capabilities, examples,
papers, enewsletter, and communities.

Featured News
Fitting Multilevel Hierarchical Mixed Models Using PROC NLMIXED Hierarchical nonlinear mixed models are complex models that occur naturally in many fields. The NLMIXED procedure's ability to fit linear and nonlinear models with standard or general distributions enables you to fit a wide range of such models. SAS/STATŪ 13.2 enhanced PROC NLMIXED to support multiple RANDOM statements, enabling you to fit nested multilevel mixed models. This paper uses an example to illustrate the new functionality. 
SAS/STAT Users Still Moving to the SAS 9.4 Platform?
Aren't we all! We featured this handout last time, but it's timeless! If you are moving up to SAS 9.4 and would like to catch up on the recent SAS/STAT releases on that platform, this handout is for you! Get an overview of our new additions in missing data analysis, modern survival data analysis, statistical modeling, spatial point pattern analysis, Bayesian analysis, item response analysis, classification and regression trees, and performance enhancements. There's truly something here for everyone. And if you aren't currently on the move, feel free to use this handout however it helps you get into the passing lane!
