ABSTRACT
SAS is a comprehensive software package produced by the SAS Institute, Inc., which has its headquarters in Cary, North Carolina. SAS is used for business intelligence, scientific applications, and medical research. SAS provides tools for data management, reporting, and analysis. proc mixed is a procedure located within the SAS/STAT software package, a collection of procedures that implement statistical analyses. The current version of the SAS/STAT software package at the time of this publication is SAS Release 9.3, which is available for many different computing platforms, including Windows and UNIX. Additional information on ordering and availability can be obtained by calling 1-800-727-0025 (United States), or visiting the following web site: https://www.sas.com/nextsteps/index.html.
IBM SPSS Statistics (referred to simply as “SPSS” in this book) is a comprehensive statistical software package produced by International Business Machines (IBM) Corporation, headquartered in Armonk, New York. SPSS’s statistical software, or the collection of procedures available in the Base version of SPSS and several add-on modules, is used primarily for data mining, data management and database analysis, market and survey research, and research of all types in general. The Linear Mixed Models (MIXED) procedure in SPSS is part of the Advanced Statistics module that can be used in conjunction with the Base SPSS software. The current version of the SPSS software package at the time of this publication (Version 22) is available for Windows, MacOS, and Linux desktop platforms. Additional information on ordering and availability can be obtained by calling 1-800-543-2185, or visiting the following web site: https://www-01.ibm.com/software/analytics/spss/ products/statistics/.
