If you want to retrieve a data set by a point-and-click method, use the SAS Enterprise Guide. Unlike a directory or folder, a library is not physical but logical in a sense that library itself does not exist in any secondary memory unit.Įvery data set should be referred using a library in SAS, although the default library. Like a directory or folder, a library tell SAS the place where data sets exist. The following PROC REG saves the residuals and predicted values to "pew_work" that includes original variables in jeeshim.pew2004 as well.Ī SAS Data library is an alias of the collection of data sets, thereby making data management more convenient and efficient. For example, the MEANS procedure can produce a data set with aggregate statistics and matrices may be transformed into data sets in SAS/IML. SAS data sets may be generated by PROC steps. SAS/SQL (PROC SQL) allows you to connect those database and spreadsheet files through the ODBC (Open Database Connection). The IMPORT procedure can read these ASCII text files, but it can also import database (dBASE III, FoxPro, Access) and spreadsheet (Excel and Lotus 1-2-3) files. The INFILE statement also reads remote data files through the SAS/ACCESS using the TCP/IP, FTP, and URL protocols. SAS can read ASCII text files delimited with space, comma (CSV), tab, and other characters using the INPUT/INFILE/DATALINES statements in a DATA step. You may type in data and directly read them using the DATALINES (or CARDS) statement. SAS has a powerful feature of data manipulation that can handle various data sources such as ASCII text, database, and spreadsheet. A SAS data view is a virtual data set of descriptor information that points to data from other sources. A SAS data set is often referred to a SAS data file. It contains a table of observations (rows) and variables (columns) as well as descriptor information (e.g., variable names and formats). What is a data set in SAS? A SAS data set is a group of data values that SAS creates and processes. Note that there should be four semicolons at the end of data entry.means that the variable "ref" is 30 characters long. See Chapter 8 of SAS Language Reference: Dictionary (1451-1647). The OPTIONS statement changes the value of SAS system options that affect SAS system initialization, hardware and software interfacing, and the input, processing, and output of jobs and SAS files. SAS has various functions for mathematics, statistics, string, date/time, probability, and randomization. But SAS does not have the modulus operator the MOD function is used instead. SAS has arithmetic, relational, logical, and concatenation (||) operators. SAS statements used in a DATA step are either executable (e.g., DO, INPUT, INFILE, OUTPUT) or declarative (e.g., ARRAY, DATALINES, DROP, RETAIN). Operators (+, -, *, and /) do not work with missing values, while functions ignore missing.A line can have more than one statements. A statement begins and ends at any place.A SAS statement may be used in a DATA step, PROC (procedure) steps, or anywhere in a SAS program.Ī SAS program consists of DATA steps and PROC (procedure) steps.ĭATA steps handle data sets, while PROC steps actually conduct analyses.Ī DATA step is used to create or modify data sets by creating and modifying variables checking and correcting errors in data sets and writing programs (for simulations). The two pages for INPUT statement and the INFILE/IMPORT/EXPORT procedures were separated from this DATA step document on April 2003.Ī SAS program is a collection of SAS statements that may include keywords, various names (e.g., data sets, and variables), special characters, and operators.
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