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To build accurate predictive models you need clean data. Having a good understanding of the data helps you to interpret the models correctly and enables you to make sound intelligent business decisions.
SAS Enterprise Miner can help you to achieve the twin goals of improving the quality of data and gaining a good understanding the variables. Here are a few examples of how you can examine your inputs prior to model building.
(1) To examine the distributions of your input variables,
- Right click on data source
- select Explore
- Change Sample Method to Random
- Set Fetch size to Max
- Click on the “Apply” button
- Then click on the “Plot” button
- Select “Histogram”
- Select “Percent” in the “Response Statistics” box
- Select a variable and assign the role of “X”
- Click finish.
- To plot another variable click “Actions” from the menu bar, select “Histogram” and repeat the above steps.
(2) Sometimes a variable that is skewed can be made to be more symmetric by applying transformations as discussed in Chapter 2 of my new book Predictive Modeling with SAS Enterprise Miner: Practical Solutions for Business Applications, Second Edition.
(3) Use Stat Explore node as described in Chapter 2 of my book. The output window shows mode for class variables and mean, Median and other statistics for interval variables by target level.
(4) Use Decision Tree node for each input individually, or for sets of inputs to uncover patterns in the data. See Chapter 4 of my book for a detailed explanation of the Decision Tree Node.
(5) You can use the Replacement node to set ceilings on extreme values; use the filter node to delete observations with extreme values. See Chapter 2 of my book to see how these two nodes differ in treating the extreme values.
Learn more about Kattamuri Sarma and his new book Predictive Modeling with SAS Enterprise Miner: Practical Solutions for Business Applications, Second Edition.
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We finally seem to be moving away from a really cold winter and into spring. That means that SAS Global Forum is just around the corner. March 23-26 will find me and many of my SAS colleagues and SAS users in National Harbour, MD, just outside of Washington DC. Will you be there?
I was just reviewing the program for this year’s conference. Conference chair Marje Fecht, of Prowerk Consulting, will be heading up a very impressive conference. She and her team of content planners have put a lot of effort into creating an exciting line-up of invited and contributed papers and posters along with some really interesting keynote presenters. This team has focused on making the information relevant to what you do every day. (Speaking of Marje, she'd love to hear what you're looking forward to at SAS Global Forum. You can join her discussion here.)
In addition to having the chance to catch-up with friends from my years of being associated with SAS Global Forum, I always look forward to meeting new ones. I hope you will look me up in the Publications booth in the SAS demo area. There you will have a chance to peruse new books published this year and to buy them at a discount. You can also meet Publications staff who are always anxious to hear how we’re doing. While in the booth, play our game to test your SAS skills. Try to get on the leader board by getting the most correct answers!
We have about thirty of our authors who will be hanging out with us in the booth. Let them talk you into becoming a SAS author….All that SAS knowledge you have needs to be shared with other SAS users, and we can help you do that. These seasoned authors can give you the scoop on what it is like to work with SAS as your publisher.
The theme of this year’s conference is “Potential of One, Power of All.” Come join us next month at SAS Global Forum and find out for yourself how pertinent that theme really is. I hope to see you there.
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Will you be attending the American Statistical Association Conference on Statistical Practice in Tampa this week? If so, we want to invite you to set aside a few minutes to visit SAS Press in the exhibit hall and bring SAS Press your best book ideas. At this conference, we’re looking forward to making some perfect matches—your expertise in statistics with our expertise in publishing statistics books. I'll be on hand to talk with you about your book ideas and help you get started with your project.
We look forward to meeting you there!
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Does your middle-tier environment run optimally? Have you ever wondered how you can tune your environment to run more efficiently? The SAS 9.4 Web Applications: Tuning for Performance and Scalability document, which is available for download from the SAS Product Documentation page, is here to help.
The Tuning for Performance and Scalability document will walk you through the steps to tune your environment for optimization. The document includes the tuning methodology and tuning parameters for SAS web applications, SAS Web Application Server, SAS Web Server, Java Virtual Machine, and the supported operating system environments.
The SAS 9.4 release has added functionality that enables you to automatically configure a clustered environment for the SAS web applications. As a result of this added functionality, optimizing the middle tier and SAS web applications for scalability and performance is greatly simplified. The common objective of scaling a component or system is to increase the capacity for growth, increase the speed of the component, improve the efficiency, or shift or reduce the load on the component. To find out how to do this and more, read the Tuning for Performance and Scalability guide.
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Want to impress others with professional reports of any level and any amount of detail through creative techniques? Want to tackle each report put before you and break each challenge down into manageable pieces?
Lisa Fine’s new book PROC REPORT by Example: Techniques for Building Professional Reports Using SAS is what you need to turn what seemed complex into a matter of practice. Applicable to SAS users from all disciplines, Lisa’s real-life scenarios will help elevate your reporting skills learned from other books to the next level.
Each chapter focuses on a different concrete example, showing an image of the final report along with line-by-line explanations that take you through the process of creating that report. This tutorial approach helps you understand how each step contributes to the total report. Lisa’s logical, step-by-step approach enables you to tackle even the most challenging reporting requirements.
As one reviewer pointed out, this book “shows the vast and impressive capabilities of PROC REPORT, not only for new SAS report writers, but also for experienced SAS report writers.” It’s an especially effective learning tool. The accompanying data and code make it extremely easy to find solutions to common, everyday challenges and tasks that programmers encounter.
You will gain valuable insight into PROC REPORT with this new title and be able to impress others with your new or enhanced reporting capabilities. With PROC REPORT by Example: Techniques for Building Professional Reports Using SAS, what seemed complex will become a matter of practice!