Certification_-_SAS_Base_-_Summary_Note.pdf

Certification_-_SAS_Base_-_Summary_Note.pdf - SAS Data...

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1 Chapter 1 Base Programming SAS Programs 1. Interactive window using to directly modify data, such as the Report window. (P14) proc report data=data-set; columns id name sex age actlevel; run; 2. Invoke procedures that create output in the form of report. (P15) proc tabulate data=data-set; class sex; var height weight; table sex*(height weight), mean; run; Referencing SAS Files 1. LIBNAME statement used to define the libref, clinic, and to give SAS the physical location of the data files. (P18) libname clinic ‘c: \Users\Name\ sasuser’; data clinic.admit2; set clinic.admit; weight=round(weight); run; 2. Rules for SAS Names: (P19) - libref: must have a length of only 8 characters - dataset names and variable names: 1-32 characters - label: descriptive text in descriptor portion, up to 256 characters (P27) SAS Data Sets 1. SAS data set = descriptor portion + data portion (P20) Descriptor portion - the name of the data set; date and time that dataset created; the number of observations; the number of variables ; variable attributes (variable’s name, type, length, format, informat, and label) (P23) 2. Missing value - Char: blank; Num: period. (P24) 3. Variable’s length (P25) - Char: up to 32,767 bytes; 20 characters = 20 bytes - Num: a default of 8 bytes (no matter how long it is) Using the Programming Workspace 1. SAS Library (P38) - Sashelp: read-only library - Sasuser: storing personal settings (Permanent) - Work: temporary library 2. Notice: SAS can use external files, but they are not managed by SAS (P40) Chapter 2 Referencing Files and Setting Options Overview 1. LIBNAME statement is global, remaining in effect until modifying it, cancelling it or ending SAS session. LIBNAME statement assigns the libref for the current SAS session only. Each time begin a SAS session, must assign a libref to each permanent SAS data library that contains files that you want to access in that session. (P50) 2. SAS Engine is a set of internal instructions that SAS uses for writing to or reading from files in a SAS library. (P51) 3. Use LIBNAME statement to reference files that were created with other software products LIBNAME libref engine ‘SAS -data- library’ (P52) 4. Interface Library Engines Only for BMDP, OSIRIS, SPSS (P53) eg: libname re pdata spss ‘g: \ myspss.spss’ %species the libref Rptdata and the engine SPSS for the file G:\Myspss.dat in the Windows operating environment%
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2 Viewing SAS Libraries 1. Viewing Active Libraries (Menu control) 2. Viewing the Contents of a SAS Library (Menu control) 3. Viewing a File’s Contents - Displayed in the VIEWTABLE window (Menu control) 4. PROC CONTENTS - Create SAS output that describes either of the following: the contents of a library; the descriptor information for an individual SAS data set (P56) proc contents data=sas-file-specification nods; run; where sas-file-specification specifies an entire library or a specific SAS data set within a library: libref.sas-data-set or libref._all_ nods : suppresses the printing of detailed information about each file, using only when _all_ is specified.
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  • Fall '14
  • Imperative programming, Switch statement, Data element

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