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Programming Tips

Strengthen your programming skills with tips and techniques from the experts

Advanced Analytics | Analytics | Artificial Intelligence | Programming Tips

Elizabeth Bautista

Elizabeth BautistaFebruary 14, 2025 0

¡Hablemos del amor en el lenguaje de programación en SAS Viya Workbench!

En el nuevo ambiente analítico bajo demanda, SAS Viya Workbench conduce directamente al aumento de la productividad, rendimiento y confianza entre los desarrolladores de la Inteligencia Artificial. Como uno de los recientes lanzamientos de SAS, Viya Workbench este es un ambiente de cómputo que fue pensado para desarrolladores y modeladores

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Analytics | Programming Tips

Melodie RushFebruary 11, 2025 0

Getting Started with Python Integration to SAS Viya for Predictive Modeling - Fitting a Support Vector Machine (SVM) Model

Fitting a Support Vector Machine (SVM) Model - Learn how to fit a support vector machine model and use your model to score new data In Part 6, Part 7, Part 9, Part 10, and Part 11 of this series, we fit a logistic regression, decision tree, random forest, gradient

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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 | 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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Analytics | Programming Tips

Rick WicklinFebruary 3, 2025 0

Use the Lambert W function to solve equations that involve exponential functions

I previously wrote an article about the Lambert W function. The Lambert W function is the inverse of the function g(x) = x exp(x). This means that you can use it to find the value of x such that g(x)=c for any value of c in the range of g, which

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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 | Programming Tips

Melodie RushJanuary 14, 2025 0

Getting Started with Python Integration to SAS Viya for Predictive Modeling - Fitting a Neural Network Model

Fitting a Neural Network Model - Learn how to fit a neural network model and use your model to score new data In Part 6, Part 7, Part 9, and Part 10 of this series, we fit a logistic regression, decision tree, random forest and gradient boosting model to the

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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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Data Visualization | Programming Tips

Danny Sprukulis

Danny SprukulisJanuary 10, 2025 0

Utilizing SAS Viya’s Geocoding capabilities for multiple data configurations and languages

SAS' Danny Sprukulis takes you step-by-step through geocoding incomplete geographic data sources for proper visualization and through its additional capabilities.

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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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Advanced Analytics | Programming Tips

Danny Sprukulis

Danny SprukulisDecember 20, 2024 0

Simulating theme park wait times within SAS Viya, creating a live solution for hospitality operations

SAS' Danny Sprukulis walks through how he developed a model theme park to simulate attraction wait times for operational decision-making.

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Analytics | Programming Tips

Rick WicklinDecember 18, 2024 0

Generate correlation matrices with specified eigenvalues

A previous article discusses how to generate a random covariance matrix with a specified set of (positive) eigenvalues. A SAS programmer asked whether it is possible to produce a correlation matrix that has a specified set of eigenvalues. After discussing the problem with a friend, I am happy to report

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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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Cloud | Programming Tips

Carlo ColaresDecember 12, 2024 0

Estratégias de implantação canary e blue-green para SAS Viya®

Conheça alguns conceitos e estratégias para implantação de soluções que aproveitam das capacidades da nuvem e de containers com o SAS Container Runtime (SCR) O SAS, líder global de dados e IA, atua há quase 50 anos no desenvolvimento de soluções analíticas. Há alguns anos, integra suas soluções ao universo

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Brazilian Portuguese

Advanced Analytics | Programming Tips

Rick WicklinDecember 9, 2024 0

Latin hypercube sampling in SAS

While researching the topic of Latin hypercube sampling (LHS), I read an article by Emily Gao (2019) that shows how to use PROC IML in SAS to perform the algorithm. It is possible to simplify Gao's implementation of Latin hypercube sampling in SAS while also making the computation more efficient.

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Analytics | Programming Tips

Rick WicklinDecember 2, 2024 0

A historical method of generating random normal variates

Decades ago, it was a challenge to generate (pseudo-) random numbers that had good statistical properties. The proliferation of desktop computers in the 1980s and '90s led to many advances in computational mathematics, including better ways to generate pseudorandom variates from a wide range of probability distributions. (For brevity, I

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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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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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Programming Tips

Example web application and its functionality

Rodney BrownNovember 11, 2024 0

Interesting use cases of SAS job web applications

In the SAS 9.4 world, SAS Stored Processes (STP) were incredibly popular. An STP is a SAS program that is stored on a server and can be executed as required by requesting applications. On SAS 9.4, they were widely used for web reporting, analytics, building web applications, delivering packages to customers and publishing results to channels or repositories.

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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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Analytics | Programming Tips

Rick WicklinOctober 21, 2024 0

The correlogram: Visualize correlations by fitting angles

A common way to visualize the sample correlations between many numeric variables is to display a heat map that shows the Pearson correlation for each pair of variables, as shown in the image to the right. The correlation is a number in the range [-1, 1], where -1 indicated perfect

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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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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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