lecture_01 - STA511: Intro to Statistical Computing and...

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STA511: Intro to Statistical Computing and Data Management
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OBJECTIVES By the end of this course you all should be able to: Read Non-SAS files into a SAS Dataset Understand and Interpret Output from Basic SAS Procedures Manipulate Datasets Combine Two or More Datasets Create statistical reports and graphics for presentation.
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NEED FOR DATA MANAGEMENT IN RESEARCH Steps in a Research Project: Planning / Design: Research Hypotheses Formulated Data Collection Data Processing: Cleaning and Verification Data Analysis Presentation / Interpretation Publication
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WHAT IS SAS? SAS is an integrated system of software solutions that enables you to perform: Data Entry, Retrieval, and Management Report Writing and Graphics Design Statistical and Mathematical Analysis
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Manipulating Data Combining Datasets Data Summarization Graphics Statistical Analysis Report Generation Other (data mining, warehousing, etc.) CAPABILITIES OF SAS
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BASE SAS SOFTWARE SAS consists of many different packages The focus of this course is Base SAS Software Base SAS software contains: A Data Management Facility A Programming Language Data Analysis and Reporting Utilities
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DATA MANAGEMENT FACILITY SAS dataset : Data organized into a rectangular form with a known number of rows (observations) and columns (variables) Name Sex Age Height Weight Steve M 41 74 170 Rocky M 42 68 166 Kurt M 39 72 167 Deborah F 30 66 124 Jacqueline F 33 66 115 observation variable data value
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DATA MANAGEMENT FACILITY Observations (Rows) : Information about an individual entity (subject) Variables (Columns) : Information on one type of data value for all entities (subjects) (can be either character or numeric) Data Value : Each separate piece of information (observation / variable combination)
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DATA MANAGEMENT FACILITY To build a SAS dataset with base SAS software you use the DATA step: DATA EXAMPLE; I NPUT NAME $ 1- 10 SEX $ 12 AGE Hei ght WEI GHT; bMI = ( WEI GHT* . 045) / ( ( HEI GHT* . 0254) * * 2) ; DATALI NES; STEVE M 41 74 170 ROCKY M 42 68 166 KURT M 39 72 167 DEBORAH F 30 66 124 JACQUELI NE F 33 66 115 ; RUN; You are not expected to understand this code for a few more weeks!
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PROGRAMMING LANGUAGE Rules for SAS Statements: SAS statement MUST end with a semi-colon ( ; )!!! SAS statements are not case-sensitive SAS statements may begin anywhere on a line and can be continued on more than one line You can write several SAS statements on a single line Words in SAS statements are separated by blanks or special characters (see relevant documentation)
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PROGRAMMING LANGUAGE Rules for SAS Names (datasets, variables, etc.): SAS names can contain up to 32 characters involving numbers, letters, or underscores ( _ ) Unlimited number of variables (version 9). SAS names must begin with a letter or an underscore
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lecture_01 - STA511: Intro to Statistical Computing and...

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