Analytics | Learn SAS

Rick WicklinJuly 7, 2025 0

Noncentrality parameters and confidence intervals

While researching a topic on effect sizes, I learned about a SAS function that is related to noncentrality parameters. I previously wrote an article about the noncentral t distribution, which is one of several well-known distributions that contains an optional noncentrality parameter. I mentioned that the PDF, CDF, and QUANTILE

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Advanced Analytics | Learn SAS | Machine Learning

Rick WicklinJune 30, 2025 0

An application of Latin hypercube sampling to optimization

A previous article discusses a "Catch-22" paradox for fitting nonlinear regression models: You can't estimate the parameters until you fit the model, but you can't fit the model until you provide an initial guess for the parameters! If your initial guess for the parameters is not good enough, the nonlinear

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English

Advanced Analytics | Data Visualization | Learn SAS

Rick WicklinJune 23, 2025 0

How to add a curve to a moment-ratio diagram

I have previously written about the moment-ratio diagram as a graphical tool for modeling univariate distributions and also as a tool for examining the distribution of the skewness and kurtosis statistics for distributions. The simple moment-ratio (M-R) diagram from my book (Wicklin, 2013, Simulating Data with SAS, Chapter 16) is

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Analytics | Data Visualization | Learn SAS | Programming Tips

Rick WicklinJune 16, 2025 0

Find the orthant that contains a point

This article shows how to classify a set of high-dimensional data into orthants. An orthant is the d-dimensional generalization of a quadrant. For 2-D Euclidean space, there are four quadrants, often labeled by Roman numerals I-IV. The quadrants are open sets that are defined by the signs of each coordinate

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English

Learn SAS | Programming Tips

Rick WicklinJune 9, 2025 0

Generate a check digit and validate a Universal Loan Identifier in SAS

This article shows how to use SAS to implement the ISO algorithm to generate (and validate) a Universal Loan Identifier (ULI). A ULI is a long string of numbers and letters that serves as a unique identifier that is used for certain financial transactions. The ISO standard ensures that banks

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English

Learn SAS | Programming Tips

Rick WicklinJune 2, 2025 0

The modulo operation for large integers in SAS

On social media, a SAS user reported that SAS could not compute the modulo of an extremely large integer. In SAS, the modulo operation is usually performed by using the MOD function, which computes the remainder of dividing an integer, N, by another integer, d. (In symbols, the remainder is

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English

Learn SAS | Programming Tips

Rick WicklinMay 19, 2025 0

Calculate the Gini-Simpson diversity index in SAS

An article by David Corliss in Amstat News (Corliss D. (2025) "Quantifying Diversity: Calculating the Gini-Simpson Diversity Index") discusses a new statistical measure of diversity that was adopted by the US Census Bureau. The statistic is called the Gini-Simpson diversity index. The Census Bureau has published an article about how

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Advanced Analytics | Learn SAS

Mahesh ShettyMay 15, 2025 0

How to become a clinical SAS programmer in 6 months: A structured learning approach

If you have a background in pharmacy, life sciences, biotechnology, or statistics – and you’re curious about the world of clinical research – there’s one career path you might want to explore: clinical SAS programming. Maybe you’ve heard the term before and wondered what it really involves. The good news?

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English

Education

Analytics | Learn SAS

Rick WicklinMay 12, 2025 0

Stratified bootstrapping and when to use it

When you use the bootstrap method in statistics, the most common resampling method is called case resampling. For data that has N observations, each bootstrap sample is created by sampling with replacement from the N observations (or "cases") in the data. However, if the data set includes categorical variables, it

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Learn SAS | Machine Learning | Programming Tips

Rick WicklinApril 28, 2025 0

The SMOTE method for generating synthetic data

The Synthetic Minority Over-sampling Technique (SMOTE) was created to address class-imbalance problems in machine learning algorithms. The idea is to oversample from the rare events prior to running a machine learning classification algorithm. However, at its heart, the SMOTE algorithm (Chawla et al., 2002) is essentially a way to simulate

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English

Learn SAS

Chris HemedingerApril 14, 2025 0

SAS For Dummies: New edition for the modern SAS user

Introducing the new third edition of SAS For Dummies, covering SAS 9.4, SAS Viya, SAS Visual Analytics, SAS Viya Workbench and more!

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English

Learn SAS | Programming Tips

Rick WicklinApril 8, 2025 0

The Golden Section minimization method

Newton's method was in the news this week. Not the well-known linear method for finding roots, but a more complicated method for finding minima, sometimes called the method of successive parabolic approximations. Newton's parabolic method was recently improved by modern researchers who extended the method to use higher-dimensional polynomials. The

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English

Analytics | Data for Good | Learn SAS | Students & Educators

Hyeshin HwangMarch 28, 2025 0

[한국데이터정보과학회-SAS KOREA] 데이터 분석 경진대회 개최

SAS Viya와 함께 데이터 기반의 문제를 해결하다!   SAS코리아는 학생들의 데이터 분석 역량을 강화하고 일상 속 다양한 데이터 기반 문제 해결을 지원하기 위해 한국데이터정보과학회가 주관하는 대학(원)생 대상 ‘데이터 분석 경진대회’를 후원합니다. 이번 대회의 주제는 ‘SAS®Viya®와 함께 데이터 기반의 문제를 해결하다’입니다. 119팀(353명)이 대회 참여를 신청했으며, 3월 28일 SAS코리아가 제공하는 교육을 시작으로

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Korean

Education

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

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

Government

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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English

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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Education

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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English

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

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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English

Learn SAS | Students & Educators

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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English

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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English

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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English

Learn SAS | Programming Tips

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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