Sas hash object programming made easy ebook

This weeks sas tip is from michele burlew and her new book sas hash object programming made easy. Example code hash object in the data step sas support. The hash object provides a fast, easy way to perform lookups without sorting or indexing. A hash object has no scope outside of the data step in which it was created. The values of the component hash objects are read into the program data vector and merged with the adsl data. Also see the blog post 5 tips to learn and understand the hash object in sas. This paper introduces the hash object, examines a few common hash object methods, compares sas 6 techniques with the hash object, and builds rules of thumb for when to apply this new technology to your programs. This paper will demonstrate how easy it is to get started using the powerful features of the hash object and show examples of how these features can. Sas hash object programming made easy by michele m.

The removedup method is used in only one example program example 5. Use features like bookmarks, note taking and highlighting while reading sas hash object programming made easy. So, in case you are considering this technique, this book is a musthave. Intuitively, we will not consider h1 and h2 as equal if h1 has one element and h2 has 2. Declaring and instantiating a hash iterator object.

Clear removes all items from a hash object without deleting hash object. This book shows readers how to use these powerful features, which they can program to quickly look up and manage data and to conserve computing resources. Sas hash object programming made easy oreilly media. Be sure to take a look at the free chapter from her latest after reading this weeks tip. I have sas hash object programming made easy ive been crazy busy at work so i havent gone through much but i like it so far. Michele burlew is the author of several highly regarded sas books including her most recent sas hash object programming made easy. The sas system stopped processing this step because of insufficient memory. Definedata defines data to be stored in hash object. Whether youre looking to become certified, land a job, or increase your skills, youll benefit from sas macro programming made easy, third edition. When i started learning hash object programming there was only michele m. A limitation with using a hash object is that your sas session may not have enough memory to load the unique combinations into the hash object.

Because the examples presented vary in complexity, sas hash object programming made easy is useful to sas users of all experience levels, from novice programmer to advanced programmer. Sas provides various lookup techniques, and hash objects are among the newest, so therefore many users may not have yet used them. This paper is intended to provide more exposure to novice or experienced sas programmers that are looking for alternatives to data step programming. This week, ive selected a short excerpt from her latest book to share with our readers. Sas hash object programming made easy 1, burlew, michele m.

Reference, removedup method in sas component objects. Sas macro programming made easy, third edition 3, burlew. A hash object is created within a data step, used within the same data step, and it is automatically removed when the data step completes. In this video i explain about the way to create a hash object.

Michele is the author of several extremely helpful sas books. Michele burlews new book, sas hash object programming made easy takes users through the newest lookup technique from sas, one that has many still shaking their heads. Download book sas hash object programming made easy pdf sas hash object programming made easy by michele m. The underpinnings of the modern sas hash object can be traced to the ingenious early work by dorfman 2000b. Michele burlews sas hash object programming made easy shows readers how to use these powerful features, which they can program to quickly look up and manage data and to conserve computing resources. Sas hash object programming made easy kindle edition by burlew, michele m download it once and read it on your kindle device, pc, phones or tablets. Shajenko, bank of america, boston, ma abstract in sas version 9. One data variable simple hash object compositekey hash object multiple data variables multivariable hash object complex hash object hash object structure is defined by. Sas hash object programming made easy kindle edition by michele m. For more information about the first and next methods, see sas component objects. Hash object added 0 items when memory failure occurred. The hash object does not assign values to key variables for example, h.

Reference, and the replacedup method in sas component objects. Hash objects, an efficient lookup tool in the sas data step, are objectoriented programming structures that function differently from traditional sas language statements. Macro programming is a required skill for many sas programming jobs, and the sas advanced programming certification exam tests macro processing concepts. Dorfman, independent consultant, jacksonville, fl lessia s. Sas hash objects have the prestige of being the fastest way to do searches using lookup tables provided that they can be loaded into memory limited by the available amount of memory that your sas session has. I found two topics in chapter 5 which lack some detail. Michele burlews sas hash object programming made easy shows readers how t. They seem scary because they operate a little differently from the sas language people are used to. Data variables four types of hash object structure. Hash objects are very important in sas especially for performance management.

A censor variable is created based on the values from the component hash objects. Sas basics 10 hash objects in sas hash joins basics duration. Not many data step programmers have used hash objects much, burlew says. December i used an example on joining data using hash object instead of merge statement in the data step. Using the data step hash object to perform common clinical programming chores. Sas dataset providing key and data for a hash object. So the book is essentially still up to date oct 2016.

Burlew hash objects, an efficient lookup tool in the sas data step, are object oriented programming structures that function differently from traditional sas language statemen. Michele burlews sas hash object programming made easy shows readers how to use these powerful features, which they can program to quickly look up and manage data and to. Sas basics 10 hash objects in sas hash joins basics. Reference, replace method in sas component objects. This weeks sas tip is from michele burlew and her latest book sas hash object programming made easy. Visit her author page to read free chapters and for additional bonus content.

Therefore, if no assignment to a key or data variable appears in the program, sas will issue a note stating that the. This book has all the detail you need to get you through simple and complicated uses of hash objects. Michele burlew is the author of 7 sas books, including her most recent sas hash object programming made easy. If you like this weeks free excerpt, be sure to visit michele burlews. Definedone specifies that all key and data definitions are. Data step programming using the hash objects paul m. If youve already used hash objects some, then this book offers you some examples for techniques that you may not have tried or understood how to use. The videos shows and explains different techniques used in sas for table lookup and merging of two tables. For more information, see the remove method in sas component objects.

Whether youre looking to become certified, land a job, or increase your skills, youll benefit from sas macro programming made easy. Hash object life cycle is till the data step completes. Hashobject programming in sas malcolm macrae, aeso sean mccarthy, enmax 0. You can create a data set that contains the data in a specified hash object by using the output. Sas hash object programming made easy 1, michele m. Hash objects, an efficient lookup tool in the sas data step, are object oriented programming structures that function differently from traditional sas language statements.

Michele is the author of several revered userfriendly books. A brief history of the sas hash object the concept of inmemory data elements is not new to programming in general, or sas programming in particular. If you want to learn this the right way i suggest you join the sas programming 3 course. Sas made only minor additions to the hash object features in version 9. The examples in this book vary in complexity and are generally organized in order of increasing complexity. Novice programmers can adapt some of the simpler hash programming techniques as they develop their sas programming skills.