Introduction this document is the fourth module of a four module tutorial series. Sas programming 2 data manipulation techniques pdf get file sas programming 2 data manipulation techniques pdf. Pharmasug 2014 paper po17 healthcare data manipulation and. This course is for those who need to learn data manipulation techniques using sas data and procedure steps to access, transform, and summarize sas data sets. Sas creates a pdv to store the information for all the variables required from the data step. Essentials course and is not recommended for beginning sas. Data manipulation techniques course notes sas this course is for those who need to learn data manipulation techniques using sas data and procedure steps to access, transform, and summarize sas data sets. Its nice to know what data set statement and options are and how they can facilitate sas processing. Sas processes data and writes results to memory one observation at a time, passing the result back to the os for writing to disk. Both can and should be performed within a single data step ensures efficient and easy to follow sas.
Use contents, copy, contents if you want to see the contents of a data set, copy a data set, and then visually compare the contents of the second data set with the first. They do not help to reduce the time of execution, but instead, they reduce repetition of similar steps in your program and enhance the readability of programs. Professional programming conventia, including comments and system options reading simple sas data. The statements within the data step are processed in the sas client session, but the output data. The os reads the data into memory in blocks from the disk drive and then passes data to sas for processing. Population data policy development education research data manipulation and data cleaning. A data step is a type of sas statement that allows you to manipulate sas data sets. In addition, they allow various interactive mechanisms to subset the data andor select variables to be displayed. Notes and labs from sas programming 2 data manipulation techniques ecprg293. Healthcare data manipulation and analytics using sas, continued other challenges in healthcare data are the large volume, complexity and heterogeneity of medical data and their poor mathematical characterization and non canonical form. Sas programming on data manipulation and preparation.
Arrays are sas data step statements that allow iterative processing. Both can and should be performed within a single data step ensures efficient and easy to follow sas programming. Sas data step compile, execution, and the program data vector. Data dictionary data a which defines the numbers or codes reference in data b 2. Creating sas datasets by reading and processing non sas data. Ds2 is included with base sas software and sas viya software and shares core features with the sas data step. The department of statistics and data sciences, the university of texas at austin section 1. If no data manipulation required using the procedure would be. A log is generated with information about processing, including notes, warnings and errors.
Nesug 2006 data manipulation and analysisdata manipulation. This is the traditional sas data step processing mode in which the data step runs in a single thread on the sas workspace server using the v9 engine. Sas stat it runs popular statistical techniques such as hypothesis testing, linear and logistic regression, principal component analysis etc. A simultaneous process data manipulation and data cleaning are not mutually exclusive, rather they go handinhand. Data manipulation using the data step course outline destiny corporation page 1 course length. You can use a select group for conditional processing in a data step. Matchmerging data sets that lack a common variable if data. Hands on training audience this course is designed for sas programmers who need a more indepth understanding of the data step. Sas users who have taken an introductory level course and want to further theirs sas skills. Understanding the internals of data step processing, what is happening and why, is crucial in mastering code an output.
Sas 2 indatabase processing network bottlenecks between sas and the dbms constrain access to large volumes of data the best practice today is to read data into the sas environment for processing. Now it is the time to complete the sas programming on data manipulation and preparation training with. Most results also can be output as sas data sets for further analysis with other tasks. Capability data step proc sql creating sas data sets sas data files or sas views x x create indexes on tables x creating sas data sets from input files that contain raw data external files x analyzing, manipulating, or presenting your data. Remember data set options can also be used in proc steps. Key concepts a sas date, time or datetime variable is a special case of a numeric variable. You can use these variable list names to reference variables that have been previously defined in the same data step. Understanding the internals of data step processing. For highly repeatable processes, this might not be efficient because it takes time to transfer the data and resources are used to temporarily store in the. Dec 22, 2015 sas macros are typically considered as part of advance sas programming and are used widely in reporting, data manipulation and automation of sas programs. Essentials course and is not recommended for beginning sas software users. This manual describes the import and export facilities available either in r itself or via. Sas tutorial for beginners to advanced practical guide.
Hello everyone, i have a strange situation in sas that ive never come across before. Each procedure enables us to analyze and process that data in specific way. The os reads the data into memory in blocks from the disk drive, and then passes data to sas for processing. Many sas programmers avoid arrays thinking they are difficult, but the truth is they are not only easy to use, but make your work easier. Sas report formats can be shared with sas web report studio and sas. Pharmasug 2014 paper po17 healthcare data manipulation. This guide teaches the basics of manipulating data using javascript in the browser, or in node. Ds2 is included with base sas and is used in conjunction with the sas data step. Advance tips for manipulating data in commonly used sas. This course is for those who need to perform advanced data processing and manipulation. This course is for those who need to perform advanced data processing and manipulation, and create a variety of outputs.
Specifically, these tasks are geared around preparing data for further analysis and visualization. Almost all the data needs to be manipulatedprepared before data analysis. It is designed to help you master sas base programming essentials on data manipulation and preparation. You can read from multiple sas data sets and combine and modify data in different ways. Data b the variable fields and the codes per each id data. Export data to standard and commadelimited raw data files. Oct 12, 2017 ds2 is a sas proprietary programming language that is appropriate for advanced data manipulation and applications. Students should take protechs introduction to sas before attending this class. Downloadsas programming 2 data manipulation techniques pdf. Data manipulation techniques issued by sas this course teaches data manipulation techniques using sas data and procedure steps to access, transform, and summarize sas data sets. Therefore, they are more flexible than proc print is. Data variable manipulation sas support communities.
Processing data iteratively do loop processing conditional do loop processing sas array processing using sas arrays restructuring a data set rotating with the data step combining sas data sets using data manipulation techniques with matchmerging creating and maintaining permanent formats creating permanent formats. This course is for those who need to learn data manipulation techniques using sas data and procedure steps to access, transform, and summarize sas data. Native help files, online resources, texts introduction to the program data vector and data step processing ethics of secondary data analysis day 2. It is not easy to learn the best way to complete a task, if a best way actually exists.
Paper 5127 tips for manipulating data marge scerbo, chpdmumbc abstract as a beginning sas programmer, you could be easily overwhelmed with the sheer size of the language. Understanding data step processing using pdv sas institute. To be a good sas programmer it is essential that you understand the intricacies of the data step because some tasks related to data manipulation and data set creation may only be done via the data step they cannot be done or are too complex to be done via sas. It is used for data manipulation such as filtering data, selecting, renaming or removing columns, reshaping data etc. Does one method actually work better than another does. The course builds on the concepts that are presented in the sas. These include missing, corrupted, inconsistent, or nonstandardized data. This module describes the use of spss to do advanced data manipulation. Every sas programmer is required to master sas data manipulation and preparation programming skills, which are critical and highly demanded in the sas data industries. In this case, the output from the proc freq will be saved to a pdf file and a rtf file. When you need to accumulate totals for a group of data, for example, if you need to see total salaries allocated to special projects by department, the input data set needs to be sorted on the byvariable. You can control when sas writes an observation to a sas data set by using an explicit. These methods provide a tablelike display of the data. If a by statement is used for example when merging two data sets the pdf does not empty if there are still observations with the same value of the by variable.
The course builds on the concepts that are presented in the sas r programming i. Since 1976, sas has been giving customers around the world the power to know. Its nice to know what data set statement and options are and how they can facilitate sas processing intelligently. For highly repeatable processes, this might not be efficient because it takes time to transfer the data.
The topics includes creating labels and formats, modifying character and numeric data values, working with sas dates, generating data with do loops, processing. It is usually created from datalines in ones code, or as the result of data extraction manipulation from either a database, a sas dataset, an external raw file or another program what is a sas data step. Includes this course, programming 1, practice exam, exam voucher, and sas certification prep guide pdf. The values of a date variable represent the number of days. Arrays, on the other hand, can do the same job in only a few lines. Figure 1 data flow for base sas data step processing. Rungroup processing proc datasets supports rungroup processing. The course builds on the concepts that are presented in the sas programming essentials course and is not recommended for beginning sas software users. Proc contents simple, proc print, prov freq, proc means read advanced data step topics pdf ucla sas module subsetting data ucla sas module for common system options ucla sas. Data manipulation techniques course notes sas this course is for those who need to learn data manipulation techniques using sas data and procedure steps to access, transform, and summarize sas data. The sas data step is one of the primary methods for creating sas data sets. The work of manufacturing this is done in a sas data step through the use of a.
Data manipulation techniques course contents introduction course logistics creating course data files controlling input and output writing observations explicitly writing to multiple sas data sets selecting variables and observations summarizing data creating an accumulating total variable accumulating totals for a group of data. Control which observations and variables in a sas data set are processed and output. Managing data investigate sas libraries using utility procedures. Ds2 is included with base sas and intersects with the sas data step but also supports additional data. Sas datetime informats are able to convert raw data into a date, time or datetime variable. The topics includes creating labels and formats, modifying character and numeric data values, working with sas dates, generating data with do loops, processing variables with arrays. Proc contents simple, proc print, prov freq, proc means read advanced data step topics pdf ucla sas module subsetting data ucla sas module for common system options ucla sas module for creating variables. See summary of ways to combine sas data sets for more information the set statement reads sas data sets into the data step for processing. Programming ii data manipulation using the data step. This course is for those who need to learn data manipulation techniques using the sas data step and procedures to access, transform, and summarize data. Getting started 3 the department of statistics and data sciences, the university of texas at austin section 1. Paper 5027 data step essentials neil howard, pfizer, inc. Data manipulation using the data step programming ii. Sas macros for faster data manipulation complete tutorial.
Proc fsview or vt are easy to use, and on line help is. Data manipulation, data cleaning, and data processing in javascript. This class of functions is sometimes called string functions. Ds2 is a sas programming language that is appropriate for advanced data manipulation. Matchmerging data sets that lack a common variable if data sets dont share a common variable, you can merge them using a series of merges in separate data steps. You can also use the merge statement, the modify statement, and the update statement to read sas data sets into a data. You can then use a by statement in the data step to process the data in groups. Sasstat manual, which is one of the manuals contained in the sas online. To be a good sas programmer it is essential that you understand the intricacies of the data step because some tasks related to data manipulation. Getting started department of statistics the university of. Ds2 is a sas proprietary programming language that is appropriate for advanced data manipulation and data modeling applications. The course builds on the concepts that are presented in the sas programming 1. A table, created in or for sas, that sas can recognize and knows how to process.
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