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Learn SAS

Learn about the latest tips, tutorials, upcoming events and certifications

Advanced Analytics | Analytics | Data Visualization | Learn SAS

Harry SnartAugust 16, 2021 0

Understanding your data: Missing at random versus missing not at random

In our last blog we explored the potential impact of missingness in data in terms of its impact on models which require complete case analysis. We took a simple view that data was missing with an equal, independent, probability for any given model input. This week we explore cases where

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Learn SAS | Programming Tips

Rick WicklinAugust 11, 2021 0

More on the SWEEP operator for least-square regression models

One of the benefits of using the SWEEP operator is that it enables you to "sweep in" columns (add effects to a model) in any order. This article shows that if you use the SWEEP operator, you can compute a SSCP matrix and use it repeatedly to estimate any linear

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Advanced Analytics | Analytics | Data Visualization | Learn SAS

Harry SnartAugust 9, 2021 0

Understanding your data: Assessing the impact of missingness and dimensionality

In the previous section of this series we discussed ways of assessing the relationship between variables. This week we change the focus to the shape and sparsity of our dataset. One area of Explanatory Data Analysis which we’ve missed so far is the impact of missingness in data. Having missing

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Learn SAS | Programming Tips

Rick WicklinAugust 9, 2021 0

Never multiply with a large permutation matrix

Do you ever use a permutation matrix to change the order of rows or columns in a matrix? Did you know that there is a more efficient way in matrix-oriented languages such as SAS/IML, MATLAB, and R? Remember the following tip: Never multiply with a large permutation matrix! Instead, use

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Analytics | Learn SAS

students in front of computer, students learning

Lynn LetukasAugust 4, 2021 0

What are the best skills for adults going 'back to school'?

The predicted “Great Resignation” is underway, with the US Labor Department reporting people quitting jobs in record numbers, with 4 million doing so in April alone. At the same time, companies are expected to step up hiring, with 77 percent of executives in a recent poll claiming they plan to

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Data Visualization | Learn SAS

Rick WicklinAugust 4, 2021 0

Use SAS to create mathematical art

In a previous article, I discussed a beautiful painting called "Phantom’s Shadow, 2018" by the Nigerian-born artist, Odili Donald Odita. I noted that if you overlay a 4 x 4 grid on the painting, then each cell contains a four-bladed pinwheel shape. The cells display rotations and reflections of the pinwheel. The

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Data Management | Learn SAS

Ron CodyAugust 3, 2021 0

Migrating from SAS University Edition to SAS OnDemand for Academics

Thousands of SAS users are migrating from SAS University Edition to SAS OnDemand for Academics (ODA). I thought I would share some of my thoughts, having just finished two books using ODA (Getting Started with SAS Programming: Using SAS Studio in the Cloud and A Gentle Introduction to Statistics Using

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Data Visualization | Learn SAS

Robert AllisonJuly 22, 2021 0

How long will your dog live?

How long do dogs live? ... That's a good/tough question. Some live longer than others, but what are the determining factors? Let's throw some data to this problem, and see if we can fetch some answers! But before we get started, how about a random picture to get you into

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Learn SAS

Rick WicklinJuly 21, 2021 0

Operations on lists in SAS/IML

To get better at something, you need to practice. That maxim applies to sports, music, and programming. If you want to be a better programmer, you need to write many programs. This article provides an example of forming the intersection of items in a SAS/IML list. It then provides several

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Advanced Analytics | Analytics | Artificial Intelligence | Learn SAS

Olivia OjedaJuly 15, 2021 0

10 data science job statistics that will blow your mind

In 2012, Data Scientist was dubbed the sexiest job of the 21st century by Harvard Business Review and it is one of the most in-high demand jobs in the world. Data has become a key part of every organization as technology flourishes. As the world become increasingly digitized, businesses are

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Learn SAS | SAS Administrators

Raymond ThomasJuly 15, 2021 0

Going from SAS 9 to SAS Viya and I can hardly contain myself

I am a long-time SAS 9 Administrator, I feel very confident in my understanding of SAS 9 administration. I will admit I don’t know everything, but I have been administering SAS since the days of SAS 9.1.3. I often tell my students I am a general practitioner when it comes

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Analytics | Learn SAS

Rick WicklinJuly 12, 2021 0

The QR algorithm for least-squares regression

In computational statistics, there are often several ways to solve the same problem. For example, there are many ways to solve for the least-squares solution of a linear regression model. A SAS programmer recently mentioned that some open-source software uses the QR algorithm to solve least-squares regression problems and asked

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Learn SAS | Programming Tips

Leonid BatkhanJuly 6, 2021 0

Little known secrets of DO-loops with index variables

SAS' Leonid Batkhan reveals how to use versatile iterative DO loops with index variable pertaining to SAS DATA steps.

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Analytics | Learn SAS

Rick WicklinJune 28, 2021 0

Estimate a bivariate CDF in SAS

This article shows how to estimate and visualize a two-dimensional cumulative distribution function (CDF) in SAS. SAS has built-in support for this computation. Although the bivariate CDF is not used as much as the univariate CDF, the bivariate version is still a useful tool in understanding the probable values of

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Learn SAS

Mark StevensJune 18, 2021 0

Two New SAS® Viya® Programming Certifications

SAS Global Certification is pleased to announce two (yes two!) new SAS Viya programming certifications. Traditional SAS programmers need to migrate their code and data to SAS Viya environments, and there are important skills required to make a successful transition. SAS Viya includes Cloud Analytic Services (CAS), where data is

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Analytics | Artificial Intelligence | Data Management | Learn SAS

Marvio PortelaJune 17, 2021 0

El CEO, el catalizador de la transformación digital de las empresas

La transformación digital es un fenómeno tecnológico y de negocio que continúa con una fuerte inercia dentro de las organizaciones de todas las industrias. Esta inercia ha sido impulsada de forma importante durante la actual pandemia, y se prevé que permanezca como uno de los temas centrales en la agenda

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Communications | Education

Learn SAS | Programming Tips

Leonid BatkhanJune 14, 2021 0

Using SYSTASK and SAS macro loops for massively parallel processing

SAS' Leonid Batkhan presents an implementation of parallel processing by spawning multiple SAS sessions using SYSTASK statements with subsequent synchronization.

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Learn SAS | Students & Educators

Sophia RowlandJune 11, 2021 0

SAS and Microsoft Certifications for Data Scientists

SAS and Microsoft certifications can help with your professional and career development. And now, you can even take certification exams from the comfort of your own home.

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Learn SAS

Shelley Sessoms

Shelley SessomsJune 9, 2021 0

We need your vote! SAS Support Communities are on the 2021 Khoros Kudos awards ballot

Cast your ballots for the SAS Support Communities, nominated for the Khoros Kudos Award: Best-in-Class: Community.

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Analytics | Learn SAS

Rick WicklinJune 9, 2021 0

Rank-based scores and tied values

Many nonparametric statistical methods use the ranks of observations to compute distribution-free statistics. In SAS, two procedures that use ranks are PROC NPAR1WAY and PROC CORR. Whereas the SPEARMAN option in PROC CORR (which computes rank correlation) uses only the "raw" tied ranks, PROC NPAR1WAY uses transformations of the ranks,

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Learn SAS | Students & Educators

Julie BrownJune 8, 2021 0

Everyone can code with SAS® CodeSnaps

SAS® CodeSnaps is an easy, affordable, and engaging tool. All you need is one iPad, the free CodeSnaps app, one Sphero robot, and a problem to solve. Students work collaboratively in teams to generate the code required to move the Sphero; they build a program using the printable coding blocks, scan it with the app, and execute the program to check their logic. CodeSnaps is accessible and appropriate for all learners across all disciplines. Get creative and challenge your students to navigate an obstacle course, find members of a word family, explore the digestive system, or travel the Oregon Trail. Your imagination is your only limitation.

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Learn SAS | Programming Tips

Ron CodyMay 25, 2021 0

Reordering rows and columns in a 2x2 table with SAS® Studio Tasks

In SAS Studio, the ordering of rows and columns in the Table Analysis task are, by default, arranged by the internal ordering of the values used in the table. The table arranges the variables alphabetically or numerically by increasing value. For example, traditional coding uses 1 for Yes and 0

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Learn SAS

Rick WicklinMay 24, 2021 0

How to quickly find documentation for a SAS procedure

I refer to the SAS documentation every day. Usually, I want information about SAS syntax and the statistical formulas and algorithms for various options and statements. Although I have bookmarked common documentation books and chapters, sometimes it is easier to perform an internet search to find information. I've discovered a

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Learn SAS | SAS Events | Students & Educators

Trent SmithMay 20, 2021 0

SAS honors educators and students for excellence in analytics and data science

The demand for people with analytics and data science skills continues to outpace supply – and SAS skills are among the most prized. Through programs such as the new  SAS Academic Specialization, the company is building a sustainable pool of data science and analytics talent. At the virtual SAS Global Forum 2021, the company recognized

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Advanced Analytics | Analytics | Data Management | Learn SAS

Victoria SilvaMay 19, 2021 0

Em sessão de demonstração, Brett Wujek mostra como o AutoML pode facilitar os negócios

Brett Wujek, Principal Product Manager do SAS, mostrou detalhadamente o cliclo analítico e como o SAS Viya ajuda a facilitar o modo como os dados podem ser tratados, oferecendo um equilíbrio natural e efetivo entre os recursos de automação e a interação humana. Wujek frisou a importância da interação humana

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Brazilian Portuguese

Learn SAS | Programming Tips

Rick WicklinMay 19, 2021 0

Implement a product function in SAS

A SAS programmer noticed that there is not a built-in function in the SAS DATA step that computes the product for each row across a specified set of variables. There are built-in functions for various statistics such as the SUM, MAX, MIN, MEAN, and MEDIAN functions. But no DATA step

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Analytics | Learn SAS

Rick WicklinMay 17, 2021 0

Standardized regression coefficients in PROC GLIMMIX

I previously wrote about how to understand standardized regression coefficients in PROC REG in SAS. You can obtain the standardized estimates by using the STB option on the MODEL statement in PROC REG. Several readers have written to ask whether I could write a similar article about the STDCOEF option

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Analytics | Learn SAS | Programming Tips

Rick WicklinMay 12, 2021 0

Nonstandard ways to standardize variables

You can standardize a numerical variable by subtracting a location parameter from each observation and then dividing by a scale parameter. Often, the parameters depend on the data that you are standardizing. For example, the most common way to standardize a variable is to subtract the sample mean and divide

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Learn SAS | Programming Tips

Rick WicklinMay 10, 2021 0

Odani's truism for fractions that are near each other

Odani's truism is a mathematical result that says that if you want to compare the fractions a/b and c/d, it often is sufficient to compare the sums (a+d) and (b+c) rather than the products a*d and b*c. (All of the integers a, b, c, and d are positive.) If you

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Learn SAS | Programming Tips

Rick WicklinMay 5, 2021 0

Odani's truism: A probabilistic way to compare fractions

Quick! Which fraction is bigger, 40/83 or 27/56? It's not always easy to mentally compare two fractions to determine which is larger. For this example, you can easily see that both fractions are a little less than 1/2, but to compare the numbers you need to compare the products 40*56

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