Like macro variables, you generally use macros to generate text. Using normal sas functions in macro processing some of the magic in advanced macro processing comes from the ability to use normal sas functions, sometimes referred to as data step functions. Since most macros are generic ones, this particular knowledge can save valuable development, debugging, and validation time. In additonal, there is a decided advantage to being able to calculate values outside of a data step, because adding another. Sas macro programming tips and techniques south central sas.
Macro processing defining and calling macros macros are compiled programs that you can call in a submitted sas program or from a sas command prompt. Implement by processing for your entire sas program the. Writing cleaner and more powerful sas code using macros patrick breheny. Macro basics the two basic elements of macro code are. Creating and using lists of macro variables ronald j. Writing cleaner and more powerful sas code using macros myweb. Fehd, centers for disease control and prevention, atlanta, ga, usa art carpenter, ca occidental consultants, vista, ca, usa abstract list processing or dynamic programming techniques free up your programming time by eliminating hard coded parameter values. This paper is designed for people who know the basics of sas programming, but know nothing about sas macro programming. The power of this command is that data that previously was. In this seminar we will cover the following topics. Parallel processing with base sas jim barbour, experian information solutions, inc. The example in this section shows you how the macro processor creates and resolves a macro variable.
Cohen astrazeneca lp abstract the sas macro language is another language that rests on top of regular sas code. Process is an observed variable ols and logistic regression path analysis modeling tool. The macro facility is a code generator that allows you to store values and use them with other operations throughout the data step. Standard sas macros for standard datetime processing. The call symput command takes a single dataset value and assigns it to a macro variable. The example program in the following figure contains a macro definition, a macro call, and a proc print step.
The macro facility is a text processing facility for automating and customizing. You then expand the macro using sas inputoutput functions to allocate a sas library and read various items from. The timing of when the macro triggers are executed is very confusing when you are using rsbumit blocks inside of a macro. Macros and parallel processing posted 01292018 2294 views in reply to rhys. Installing the process custom dialog in spss process macro.
Pdf my previous contribution on sas macro variables van santen, 2009 introduced the basic aspects of this time saving tool of the. Coders corner, 4 pp using proc contents output and symput. When you submit a sas program, the contents of the program goes to an area of memory called the input stack. Once a program reaches the input stack, sas transforms the stream of characters into individual tokens. Single, double, triple ampersand sas macro variables.
So date literals will work in sas code and when you use the %sysfunc macro function to call a sas function like intnx and they will work in the %sysevalf macro function. However, not every program is improved by using macros. Abstract parallel processing is a potentially powerful tool for sas performance tuning. The program data vector is a logical area of memory that is created during the data step processing. Macro processing can be helpful in creating insightful summaries from your claims file with less.
The example in this section shows you how the macro processor creates and resolves a macro. If used properly, it can make programming easier and more fun. It includes many base and advanced tutorials which would help you to get started with sas and you will acquire knowledge of data exploration and manipulation, predictive modeling using sas. To illustrate how the compiler and the macro processor work together, the following figure contains the macro processor and the macro. How the macro processor compiles a macro definition. So you will need to use %sysevalf if you want use arithmetic or comparisons of date literals in macro. Upon completion of this tutorial, you would understand how to create macros. Theres a myth out there that one needs to license sas connect in order to conduct parallel processing.
I use the terms preprocessing and macro processing, or. Using normal sas functions in macro processing some of the magic in advanced macro processing comes from the ability to use normal sas functions, sometimes referred to as data step. Sas builds a sas dataset by reading one observation at a time into the pdv and. An introduction to sas macros 10 the sas macro language a second sas programming language for string manipulation. Sas tutorial for beginners to advanced practical guide. Abstract the macro facility is an important feature of the sas. The rlm macro was released with the publication of regression analysis and linear models in the summer of 2016.
Standard sas macros for standard datetime processing qin lin, applied clinical intelligence, llc, bala cynwyd, pa tim kelly, applied clinical intelligence, llc, bala cynwyd, pa abstract. Please read the macro documentation and some of the many papers on macro. Macro programmers generally accept that macros create sas code. Sas has a powerful programming feature called macros which allows us to avoid repetitive sections of code and to use them again and again when needed. But the %eval macro function will not recognize date literals. The sas mediate macro ellen hertzmark, mathew pazaris, and donna spiegelman june 6, 2012 abstract the %mediate macro calculates the point and interval estimates of the percent of treatment exposure e. The macro facility is an important feature of the sas. It can be downloaded from the books web page and is documented in appendix a of the book. These tokens are transferred to different parts of the sas system for processing, such as the data step compiler, the macro processor, and the sas. Macro programming is generally considered an advanced topic. Create sas macro variables that contain values from rows in a querys result x x send dbmsspecific sql statements to a database management system dbms and retrieve dbms data. This tutorial explains sas macros with practical examples. My sas server is on linux and my client is windows, so i cant use %include.
But, while macros certainly can be challenging, it is also true that the basic concepts are not difficult to learn. While this is a great article on by processing using macros, sas 9. In this sas tutorial, we will explain how you can learn sas programming online on your own. Using macros to automate sas processing sas support. Post processing mprint outputs to generate macro free code jim edgington, quintiles, inc. Exam content guide 2 macro processing create and use userdefined and automatic macro variables within the sas macro language. Introduction the sas macro facility is a component of base sas. The macro processor creates an entry in the symbol table for the macro variable year.
Macro execution begins with the macro processor opening the sasmacr catalog to read the appropriate macro entry. Postprocessing mprint outputs to generate macrofree code. How a macro program is compiled 114 how a macro program executes 120. Spss users, you must install the custom dialog file that comes with process. In a program with macro activity, the macro processor can generate text that is placed on the input stack to be tokenized by the word scanner. Node 1 of 3 node 1 of 3 how sas processes statements without macro activity tree level 3. If you reference a macro variable or call a macro is that going to happen on the local machine and then the resulting generated sas. This seminar is designed to introduce the basics of sas macro language. Knowing sas macros is an advantage in the job market over other candidates. Sas macro variables and array processing my previous contribution on sas macro vari ables van santen, 2009 introduced the basic aspects of this time saving tool of the sa s base installation. Processing partial or invalid datetime values to meet certain needs imposes challenges for all sas.
As the macro processor executes the compiled instructions in the macro entry, it performs a series of simple repetitive actions. In order to run process using the pointandclick interface familiar to. Pdf sas macro variables and array processing researchgate. This paper will help you to understand the timing of macro processing and its relationship with sas language processing. Writing cleaner and more powerful sas code using macros. The example program in macro app in the input stack contains a macro definition, a macro call and a proc print step. This section describes macro processing and shows the typical pattern that sas follows to process a program containing macro elements. I know gtl at least ive heard of it, not that i have great experience in this area but i agree that for this example might be a bit overkill i would rather do it manually i looked at your code and i see that you used the put function.
It is widely used through the social, business, and health sciences for estimating direct and indirect effects in. Macro processing macro processing makes identifying claims with multiple chronic conditions easier. To illustrate how the compiler and the macro processor work together, the following figure contains the macro processor and the macro variable symbol table. Implement by processing for your entire sas program 12. Some of the magic in advanced macro processing comes from the ability to use normal sas. Sas macro programming is considered as an advanced sas. Available for spss and sas, rlm is a supplement to sas. Syntax description %sysevalfexpression troubleshooting macro variable references enables you to write your own messages to the sas log.
1031 374 1207 493 616 1493 124 650 764 1034 1384 578 590 897 704 612 1269 98 375 1107 760 455 190 1427 675 957 288 637 564 272 1481 575 1079 199 732 469 916 71 1087 699 985 552 256 142 1339 213 483