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Advanced Analytics | Analytics | Data Management | Data Visualization | Learn SAS | Machine Learning | Students & Educators

Gonzalo Quintana

Gonzalo QuintanaMarch 17, 2025 0

Formando a la Próxima Generación de Analistas: mentoring de SAS en la UC3M

En el vertiginoso mundo de la analítica, la teoría es fundamental, pero la experiencia práctica es la que realmente marca la diferencia. En SAS, lo sabemos bien. Por eso, hemos forjado una alianza estratégica con la Universidad Carlos III de Madrid para impulsar el talento emergente, brindándoles la oportunidad de

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SAS Spain | Spanish

Learn SAS | Programming Tips

Rick WicklinMarch 17, 2025 0

Find the location of a run-time error in a user-defined function in SAS

Every programmer makes errors. Therefore, learning to debug a program is an important part of learning to program. Another skill is learning to decipher cryptic error messages, which can be as hard to interpret as hieroglyphs. One helpful skill is learning to navigate a "traceback" error. A traceback error message

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Analytics | Learn SAS | Programming Tips

Rick WicklinMarch 3, 2025 0

An explicit formula for eigenvalues of an AR(1) correlation matrix

The first-order autoregressive (AR(1)) correlation structure is important for applications in time series modeling and for repeated measures analysis. The AR(1) model provides a simple situations where measurements (on the same subject) that are closer in time are correlated more strongly than measurements recorded far apart. The AR(1) model uses

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Analytics | Learn SAS

Alexis MallisFebruary 28, 2025 0

Develop your AI literacy with SAS trainings

AI is pushing the boundaries of innovation. Understanding how it works isn’t just for tech experts; it’s for everyone. Whether you have a basic understanding or are looking to sharpen your expertise, SAS has developed AI and machine learning courses to help you understand why AI matters. By combining practical,

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Analytics | Learn SAS

Rick WicklinFebruary 24, 2025 0

Use the EFFECTPLOT statement to visualize binomial regression models in SAS

In a binomial regression model, the response variable is the proportion of successes for a given number of trials. In SAS regression procedures, you specify a binomial model by using the EVENTS/TRIALS syntax on the MODEL statement. Many analysts use the LOGISTIC or GENMOD procedures to fit binomial models. Visualizing

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Analytics | Learn SAS | Programming Tips

Rick WicklinFebruary 17, 2025 0

Deviance residuals and the DEVIANCE function in SAS

Many people have an intuitive feel for residuals in least square models and know that the sum of squared residuals is a goodness-of-fit measure. Generalized linear regression models use a different but related idea, called deviance residuals. What are deviance residuals, and how can you compute them? Deviance residuals (and

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Learn SAS | Programming Tips

Rick WicklinFebruary 10, 2025 0

Find inflection points for a function that is known only at discrete points

A previous article describes how to use SAS to find the inflection points of a 1-D function that you can evaluate at any point. The function must be given by a formula (or by an algorithm) because the root-finding algorithm needs to evaluate the function at arbitrary locations. However, sometimes

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Learn SAS | Students & Educators | Work & Life at SAS

Programa Acadêmico

Maíra PortoFebruary 6, 2025 0

Programa Acadêmico: transformando vidas pelo voluntariado

Curiosidade - esse é um dos principais valores do SAS! Ela está no coração do progresso humano e, junto com o conhecimento e a paixão, pode gerar impacto social e transformar vidas. E é exatamente isso que acontece com todos os participantes do Programa Acadêmico do SAS, uma iniciativa global que

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Brazilian Portuguese

Learn SAS | Programming Tips

Rick WicklinFebruary 5, 2025 0

Find an inflection point for a function numerically

A SAS programmer asked if it is possible to numerically find an inflection point for a univariate function, f(x). Yes! This can be solved as a variation of a classic numerical root-finding problem. Recall that an inflection point is a value (call it x0) in the domain where the graph

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Learn SAS | Students & Educators

abstract image of person running forward

Matt ScicchitanoJanuary 31, 2025 0

Achieving Perfection: Jayeshkumar's Journey to a Perfect SAS Certification Score

This article was written based off an interview. In the competitive world of data analytics, achieving a perfect score on the SAS certification exam is a remarkable feat. Dr. Jayeshkumar Kanani, a resolute data enthusiast from the Surat Municipal Institute of Medical Education and Research (SMIMER), recently accomplished this milestone.

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Learn SAS | Programming Tips

Rick WicklinJanuary 27, 2025 0

Find the real roots of polynomials in SAS

A SAS programmer had many polynomials for which he wanted to compute the real roots. By the Fundamental Theorem of Algebra, every polynomial of degree d has d complex roots. You can find these complex roots by using the POLYROOT function in SAS IML. The programmer only wanted to output

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Learn SAS | Programming Tips

Rick WicklinJanuary 22, 2025 0

SAS tip: Use the hyphen and colon operators to specify multiple data sets on the SET statement

Here's a SAS tip for you. Most SAS programmers know that SAS provides syntax that makes it easy to specify a list of variables. For example, you can use the hyphen and colon operators to specify lists of variables on many SAS statements: You can use the hyphen operator (-)

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Analytics | Data Visualization | Learn SAS | Programming Tips

Rick WicklinJanuary 13, 2025 0

12 blog posts from 2024 that deserve a second look

In a previous article, I presented some of the most popular blog posts from The DO Loop in 2024. In general, popular articles deal with elementary topics that have broad appeal. However, I also write technical articles about advanced topics, which typically do not make it onto a Top 10

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Analytics | Data Visualization | Learn SAS | Programming Tips

Rick WicklinJanuary 6, 2025 0

Top 10 posts from The DO Loop in 2024

In 2024, I wrote about 80 articles for The DO Loop blog. My most popular articles were about SAS programming, data visualization, and statistics. If you missed any of these articles, here is the "Reader's Choice Awards" for some of the most popular articles from 2024! SAS Programming The following

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Data Visualization | Learn SAS | Programming Tips

Rick WicklinDecember 16, 2024 0

A normal Christmas tree

O Christmas tree, O Christmas tree, How lovely are your branches! SAS programmers have a long history of creating yuletide-themed graphics. Christmas trees are a popular image because of their simplicity. I admit that I have indulged more than once in this holiday tradition: An old-school ASCII art image A

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Learn SAS | Programming Tips

Chris Hemedinger

Chris HemedingerDecember 13, 2024 0

3 SAS Viya Workbench use cases for SAS Users

Review these three cool use cases for SAS users, built using SAS Viya Workbench. SAS and Python for better working together!

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Analytics | Learn SAS | Programming Tips

Rick WicklinNovember 20, 2024 0

Order two-dimensional vectors by using angles

Order matters. The order of variables in tables and rows of a correlation matrix can make a big difference in how easy it is to observed correlations between variables or groups of variables. There are many ways to order the variables, but this article shows how to display the variables

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Analytics | Learn SAS

Rick WicklinNovember 18, 2024 0

The correlation between two sets of variables

In a correlation analysis, it is common to consider the correlations between all pairs of numerical variables. That is, if there are k numerical variables, most people examine the complete k x k matrix of correlations. This matrix is symmetric and has 1s on the diagonal, so more than half of the

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Learn SAS | Programming Tips

Rick WicklinNovember 13, 2024 0

A vector-to-string function for SAS IML

A previous article discusses the MakeString function, which you can use to convert an IML character vector into a string. This can be very useful. When I originally wrote the MakeString function, I was disappointed that I could not vectorize the computation. Recently, I learned about the COMBL function in

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Advanced Analytics | Learn SAS

Rick WicklinNovember 11, 2024 0

Introducing PROC SIMSYSTEM in SAS Viya

When the SAS Global Forum 2020 conference was cancelled by the global COVID-19 pandemic, I felt sorry for the customers and colleagues who had spent months preparing their presentations. One presentation I especially wanted to attend was by Bucky Ransdell and Randy Tobias: "Introducing PROC SIMSYSTEM for Systematic Nonnormal Simulation".

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Learn SAS | Programming Tips

Rick WicklinNovember 4, 2024 0

Levy flight and vectorizing a simulation in SAS

A previous article shows a simulation of two different models of a foraging animal. The first model is a random walk, which assumes that the animal chooses a random direction, then takes a step that is distributed according to a Gaussian random variable. In the second model, the animal again

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Data Visualization | Learn SAS | Programming Tips

Rick WicklinOctober 28, 2024 0

Automate the creation of a range attribute map in SAS

In SAS, range attribute maps enable you to specify the range of values that determine the colors used for graphical elements. There are various examples that use the GTL to define a range attribute map, but fewer examples that show how to use a range attribute map with PROC SGPLOT.

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Learn SAS | Programming Tips

Rick WicklinOctober 16, 2024 0

Run-time variations of the INPUT and PUT functions in SAS

The INPUT function and PUT function in SAS are used to apply informats and formats (respectively) to data. For both functions, you must know in advance which informat or format you want to apply. For brevity, let's consider only applying a format. To use the PUT function, you must know

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Learn SAS | Programming Tips

Rick WicklinOctober 14, 2024 0

Understand the PUT and INPUT functions in SAS

In SAS, the INPUT and PUT functions are powerful functions that enable you to convert data from character type to numeric type and vice versa. They work by applying SAS formats or informats to data. You cannot fully understand the INPUT and PUT functions without understanding formats and informats in

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Learn SAS

Rick WicklinOctober 9, 2024 0

Interactive procedures in SAS

SAS software supports two kinds of procedures: interactive and non-interactive. Most SAS procedures are non-interactive. They begin with a PROC statement, include one or more additional statements, and end with a RUN statement. When SAS encounters the RUN statement, the procedure executes all statements, then exits. On the other hand,

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Analytics | Learn SAS | Programming Tips

Rick WicklinOctober 7, 2024 0

The three-sigma rule

A remarkable result in probability theory is the "three-sigma rule," which is a generic name for theorems that bound the probability that a univariate random variable will appear near the center of its distribution. This article discusses the familiar three-sigma rule for the normal distribution, a less-familiar rule for unimodal

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Learn SAS | Programming Tips

Rick WicklinSeptember 30, 2024 0

Programming the formulas for an ANOVA in SAS

In practice, there is no need to remember textbook formulas for the ANOVA test because all modern statistical software will perform the test for you. In SAS, the ANOVA procedure is designed to handle balanced designs (the same number of observations in each group) whereas the GLM procedure can handle

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Learn SAS | Programming Tips

Rick WicklinSeptember 23, 2024 0

Special missing values in SAS statistical tables

A previous article about how to display missing values in SAS prompted a comment about special missing values in ODS tables in SAS. Did you know that statistical tables in SAS include special missing values to represent certain situations in statistical analyses? This article explains how to interpret four special

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Learn SAS | Programming Tips

Rick WicklinSeptember 16, 2024 0

Two ways to specify how SAS displays missing values

In statistical tables in SAS, a dot (.) represents a numerical missing value. Although a dot is the default symbol in SAS, other languages use other symbols. The R language prints the symbol NA, which stands for "not available." The MATLAB language uses NaN ("Not a Number"). In Python, many

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Learn SAS | Students & Educators

Olivia OjedaSeptember 11, 2024 0

8 free resources to start your SAS journey

Data and AI literacy are no longer optional but essential for success in both academic and professional settings. Educators are tasked with equipping students with the skills necessary to analyze and interpret information effectively. However, students and businesses can also learn these essential skills through available resources. SAS education resources

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