CH2 - STAT1303A Data Management 2 Introduction to SAS 2...

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STAT1303A Data Management 2. Introduction to SAS 2 Introduction to SAS In this chapter, a computer software SAS is introduced for data management. As we know that the amount of data is huge in the real world, performing data analysis manually becomes infeasible. It is desirable to analyze and manage the data set by computer software. 2.1 Background of SAS SAS stands for Statistical Analysis System which is designed for statistical analyses. Over time the system has evolved to include a collection of integrated software products providing data entry/management/analysis, report writing, statistical Typically, SAS are divided into the following program modules: Name Use BASE Data input, data management and simple statistical analysis GRAPH Graphics STAT Statistical analysis ACCESS Data access solution ETS Time series forecasting INSIGHT Inteactive data analysis etc. To invoke SAS, we can either click ± Start ²- > All Programs - > Statistics Applications - > SAS - > SAS 9.1 (English) , or click the SAS icon. Then, the following start-up screen is shown. HKU STAT1303A (2009-10, Semester 1) 2 1
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STAT1303A Data Management 2. Introduction to SAS Under SAS application environments, 5 main windows are shown on the screen 1. Program Editor - Enter, edit and submit SAS programs 2. Log - Records the running messages of SAS session, which is helpful for program debugging 3. Output - Display output from SAS procedures 4. Explorer - Manage SAS datasets or Create new libraries 5. Result - Show a tree-like summary of our Output window 2.2 SAS Programming Generally, data management can be run under SAS for Windows in 2 modes, namely, SAS programming and SAS solutions. For SAS programming, it requires the user writing and editing a series of SAS statements, which combines to form a SAS program, to manipulate data and conduct analysis. Normally, the SAS programs are written, opened, edited in the Program Editor Window, and submitted for processing from here. For SAS solutions, they are ready-to-use solutions, applications and tools to SAS/INSIGHT, Enterprise Miner, Time Series Forecasting System and so on. It requires the use of working through a series of point-and-click menus to select data Now, some key concepts of SAS are introduced. Typically, SAS programming is centered around data which are stored in data sets. Indeed, data sets are physical input or the output of SAS program components. For example, we can read a data
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CH2 - STAT1303A Data Management 2 Introduction to SAS 2...

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