125-2013: Essentials of the Program Data Vector …

1 Paper 125-2013 Essentials of the Program data Vector (PDV): directing the Aim to understanding the data Step! Arthur Xuejun Li, City of hope national medical center , duarte , CA ABSTRACT Beginning programmers often focus on learning syntax without understanding how SAS processes data during the compilation and execution phases. SAS creates a new data set, one observation at a time, from the Program data Vector (PDV). understanding how and why each automatic or user-defined variable is initialized and retained in the PDV is essential for writing an accurate Program . Among these variables, some variables deserve special attention, including variables that are created in the data step, by using the RETAIN or the SUM statement, and via BY-group processing ( and ). In this paper, you are exposed to what happens in the PDV and how these variables are retained from various applications.

1 Paper 125-2013 Essentials of the Program Data Vector (PDV): Directing the Aim to Understanding the DATA Step! Arthur Xuejun Li, City of Hope National Medical Center, Duarte, CA

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