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Learn SAS

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Learn SAS

Rick WicklinNovember 18, 2013 0

Vectorizing the construction of a structured matrix

In using a vector-matrix language such as SAS/IML, MATLAB, or R, one of the challenges for programmers is learning how to vectorize computations. Often it is not intuitive how to program a computation so that you avoid looping over the rows and columns of a matrix. However, there are a

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Learn SAS

Monica BealsNovember 14, 2013 0

Get ahead with new JMP e-Course

Are you looking for a flexible training option to increase or brush up on your statistical skills using JMP? In the video below, I introduce our newest e-course, JMP Software: ANOVA and Regression.

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Learn SAS

Rick WicklinNovember 10, 2013 0

The GCD and LCM functions in SAS

My daughter's middle school math class recently reviewed how to compute the greatest common factor (GCF) and the least common multiple (LCM) of a set of integers. (The GCF is sometimes called the greatest common divisor, or GCD.) Both algorithms require factoring integers into a product of primes. While helping

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Implementing CDISC Using SAS

Shelly GoodinNovember 8, 2013 0

SAS author's tip: Converting from version 5.0 transport files to native SAS

This week's SAS tip is from Implementing CDISC Using SAS: An End-to-End Guide by Chris Holland and Jack Shostak. If you'd like to learn more about what CDISC offers, look no further. As SAS user Greg Nelson said, "Combined with useful advice and working examples, this treatise on CDISC implementation

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Learn SAS

Rick WicklinOctober 30, 2013 0

Square root transformations: How to handle negative data values?

I was looking at someone else's SAS/IML program when I saw this line of code: y = sqrt(x<>0); The statement uses the element maximum operator (<>) in the SAS/IML language to make sure that negative value are never passed to the square root function. This little trick is a real

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Learn SAS

Rick WicklinOctober 28, 2013 0

How to order categories in a two-way table with PROC FREQ

If you've ever tried to use PROC FREQ to create a frequency table of two character variables, you know that by default the categories for each variable are displayed in alphabetical order. A different order is sometimes more useful. For example, consider the following two-way table for the smoking status

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Maggie MillerOctober 22, 2013 0

Educating the next generation of analytics professionals

There’s a lot of talk about the gap between the demand for analytics talent and the short supply. Jennifer Priestley of Kennesaw State led a panel at Analytics 2013 to discuss how universities are minding the gap. I caught up with her to ask what schools need to be doing

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Learn SAS

Rick WicklinOctober 21, 2013 0

Assign the diagonal elements of a matrix

SAS/IML programmers know that the VECDIAG matrix can be used to extract the diagonal elements of a matrix. For example, the following statements extract the diagonal of a 3 x 3 matrix: proc iml; m = {1 2 3, 4 5 6, 7 8 9}; v = vecdiag(m); /* v = {1,5,9}

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Maggie MillerOctober 20, 2013 0

SAS Certification tips from Analytics 2013 Orlando

Another benefit of attending the Analytics conference is the SAS Training and SAS Certification exams offered before and after the conference. We interviewed an attendee who just finished the exam for his SAS Certified Predictive Modeler using SAS Enterprise Miner 7 credential. Here’s his advice for people interested in SAS Certifications.

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Learn SAS

Rick WicklinOctober 18, 2013 0

Rotating matrices

This article is about rotating matrices. No, I don't mean "rotation matrices," I mean rotating matrices. As in turning a matrix 90 degrees in a clockwise or counterclockwise direction. I was reading a program written in MATLAB in which the programmer used a MATLAB function called ROT90, which rotates a

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Learn SAS | Programming Tips

Charu ShankarOctober 17, 2013 0

Learn to fly with SAS PROC SQL workshop

This robin chick chirped away in my backyard on a glorious summer afternoon. While papa robin hovered above, the chick hopped on ground following Dad. Soon Dad disappeared after leading the chick to a tree where two gray squirrels smacked their lips at the sight of an easy lunch. Lifting

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Learn SAS | SAS Events

Terry BarhamOctober 15, 2013 0

SAS Certifications are in demand

The demand for SAS Certifications has never been bigger. The number of SAS Certifications awarded has doubled over the last three years and in August the program had its biggest month ever with 1,195 certifications awarded. Here’s another impressive stat. More than 59,000 SAS Certifications have been awarded since the

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Learn SAS

PROC DOCUMENT by Example Using SAS

Shelly GoodinOctober 11, 2013 0

SAS author's tip: Naming ODS output

This week's SAS tip is from Michael Tuchman and his innovative book PROC DOCUMENT by Example Using SAS. Michael's book fills an important gap. For instance, in her review of the book, SAS user and senior statistical analyst Wendi Wright said: "Currently, I believe PROC DOCUMENT is a highly underused procedure and after reading

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Learn SAS

Rick WicklinOctober 7, 2013 0

How to create a library of functions in PROC IML

What is the best way to share SAS/IML functions with your colleagues? Give them the source code? Create a function library that they can use? This article describes three techniques that make your SAS/IML functions accessible to others. As background, remember that you can define new functions and subroutines in

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Advanced Analytics | Learn SAS

Rick WicklinSeptember 30, 2013 0

Generate combinations in SAS

Last week I described how to generate permutations in SAS. A related concept is the "combination." In probability and statistics, a combination is a subset of k items chosen from a set that contains N items. Order does not matter, so although the ordered triplets (B, A, C) and (C,

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Learn SAS

Shelly GoodinSeptember 27, 2013 0

SAS author's tip: A brief review of the SAS Enterprise Miner ARBORETUM procedure

This week's SAS tip is from Barry de Ville and Padraic Neville's new book Decision Trees for Analytics Using SAS Enterprise Miner. Filled with a multitude of examples and figures, this comprehensive book has received strong early user reviews. I hope that you'll also find this week's excerpt helpful in your

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Advanced Analytics | Learn SAS

Rick WicklinSeptember 23, 2013 0

Generate permutations in SAS

I've written several articles that show how to generate permutations in SAS. In the SAS DATA step, you can use the ALLPEM subroutine to generate all permutations of a DATA step array that contain a small number (18 or fewer) elements. In addition, the PLAN procedure enables you to generate

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Learn SAS

Jim SimonSeptember 18, 2013 0

Importing CSV files into SAS datasets

Sometimes, your first impulse may not be correct, like trading in your practical sedan for a hot 2-seater. Other times, your first impulse is perfect, as in the examples below. Suppose the automobile data you wish to analyze resides in a CSV file. Naturally, your first impulse is to import

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Learn SAS

Maggie MillerSeptember 17, 2013 0

Big data and visual analytics top Analytics 2013 Orlando

It’s that time of year again. The weather is cooling down and the buzz about the Analytics Conference is heating up. This year’s conference, taking place Oct. 21-22 in Orlando, will bring together more than 1,000 analytics professionals to learn the latest trends, technology and research in the field of

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Learn SAS

Maggie MillerSeptember 16, 2013 0

Sweet success with SAS training

John Taylor has been using SAS for about 12 years and admits, he loves SAS! He was first introduced to SAS while working on his BA/MA in Statistics at Boston University. “It became immediately obvious to me that knowing SAS would be invaluable to me as a statistician, so I

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Learn SAS

Shelly GoodinSeptember 13, 2013 0

SAS author's tip: SAS/ACCESS interface to OLE DB

This week's SAS tip is from Frederick Pratter and his oft-referenced book Web Development with SAS by Example, Third Edition. In case you're counting, I've featured 5 previous excerpts from Frederick's fine book on this blog. There's so much good content to choose from in this big book. After taking a look at this week's

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Learn SAS

Rick WicklinSeptember 13, 2013 0

The difference between frequencies and weights in regression analysis

This week I read an interesting blog post that led to a discussion about specifying the frequencies of observations in a regression model. In SAS software, many of the analysis procedures contain a FREQ statement for specifying frequencies and a WEIGHT statement for specifying weights in a weighted regression. Theis

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Rebecca GreeneSeptember 12, 2013 0

Happy authors don’t …

One of my favorite literary agents, Rachelle Gardner, often talks about the traits of good writers. Recently she posted a list of things that happy authors don’t do. I’ve quoted a few traits from her list that also apply to authors of technical material. Happy authors don’t … 1 …

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Jeff ThompsonSeptember 3, 2013 0

My transition from academia to SAS

I am passionate about teaching. My colleagues would probably say this is the understatement of the year. And it likely has something to do with the fact that both of my parents were teachers. I started my teaching career at the university level and after many years an unexpected opportunity

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Learn SAS

Rick WicklinSeptember 3, 2013 0

Convert a string into a vector of characters

Sometimes it is useful in the SAS/IML language to convert a character string into a vector of one-character values. For example, you might want to count the frequency distribution of characters, which is easy when each character is an element of a vector. The question of how to convert a

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Learn SAS

PROC TEMPLATE Made Easy

Shelly GoodinAugust 30, 2013 0

SAS author's tip: Using pre-defined styles

This week's SAS tip is from Kevin D. Smith and his new book PROC TEMPLATE Made Easy: A Guide for SAS Users. Kevin is a software developer at SAS with extensive experience supporting PROC TEMPLATE and underlying ODS technologies. We're excited that Kevin decided to write his book and hope

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Learn SAS

Rick WicklinAugust 26, 2013 0

Determine the version of SAS software at run time

Recently I wrote about how to determine the age of your SAS release. Experienced SAS programmers know that you can programatically determine information about your SAS release by using certain automatic macro variables that SAS provides: SYSVER: contains the major and minor version of the SAS release SYSVLONG: contains the

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Learn SAS

Peter ChristieAugust 21, 2013 0

RPM Part 3: How to use predictive modeling with SAS to analyze crime data

Fasten your seat belts - it's time to put the pedal to the metal. In this segment, we're going to burn rubber and unleash the full fury of the advanced RPM model on the unsuspecting burglary data! We will pop the hood and take a sneak peek at the drive

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Learn SAS

Rick WicklinAugust 19, 2013 0

Errors that cause SAS to "freeze"... and what to do about them

Even the best programmers make mistakes. For most errors, SAS software displays the nature and location of the error, returns control to the programmer, and awaits further instructions. However, there are a handful of insidious errors that cause SAS to think that a statement or program is not finished. For

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Learn SAS

The Little SAS Book

Shelly GoodinAugust 16, 2013 0

SAS author's tip: Reading multiple observations per line of raw data

This week's SAS tip is from Lora Delwiche and Susan Slaughter's bestselling The Little SAS Book: A Primer, Fifth Edition. With over 50 years of combined SAS experience, this powerhouse duo has helped thousands of programmers. You, too, can benefit from their instruction. The following excerpt is from SAS Press authors Lora

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