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Programming Tips

Strengthen your programming skills with tips and techniques from the experts

Analytics | Programming Tips

Rick WicklinMay 8, 2019 0

Discrimination, accuracy, and stability in binary classifiers

At SAS Global Forum 2019, Daymond Ling presented an interesting discussion of binary classifiers in the financial industry. The discussion is motivated by a practical question: If you deploy a predictive model, how can you assess whether the model is no longer working well and needs to be replaced? Daymond

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Analytics | Data Visualization | Programming Tips

Lavanya MandavilliMay 6, 2019 0

Five key security features in the SAS Visual Analytics app

App security is at the top of mind for just about everybody – users, IT folks, business executives. Rightfully so. Mobile apps and the devices on which they reside tend to travel around, without any physical boundaries that encompass the traditional desktop computers. In chatting with folks who are evaluating

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Analytics | Programming Tips

Rick WicklinMay 6, 2019 0

How to simulate data from a generalized linear model

Here's a simulation tip: When you simulate a fixed-effect generalized linear regression model, don't add a random normal error to the linear predictor. Only the response variable should be random. This tip applies to models that apply a link function to a linear predictor, including logistic regression, Poisson regression, and

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Data Visualization | Programming Tips

Robert AllisonApril 30, 2019 0

Mortgage rate graph animation

I always recommend looking at data in several different ways to get a more complete mental picture. And when the data is changing over time, one great way to view it is using an animation. Follow along for some tips & tricks to animate your own data over time. I'll

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Learn SAS | Programming Tips

Rick WicklinApril 29, 2019 0

The normal mixture distribution in SAS

Did you know that SAS provides built-in support for working with probability distributions that are finite mixtures of normal distributions? This article shows examples of using the "NormalMix" distribution in SAS and describes a trick that enables you to easily work with distributions that have many components. As with all

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Programming Tips

William BenjaminApril 25, 2019 0

Making the most of the ODS Excel destination

As a SAS programmer, you are asked to do many things with your data -- reading, writing, calculating, building interfaces, and occasionally sending data outside of SAS. One of the most popular outputs you may be tasked with creating is likely a Microsoft Excel workbook. Have you ever heard, “just

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Data Visualization | Programming Tips

Robert AllisonApril 25, 2019 0

Polar graph remix - using sgplot (no gtl/sgrender!)

A few years ago Sanjay showed how to create a polar graph by creating a gtl template, and then plotting it using Proc SGRender. These days, Proc SGPlot has all the functionality you need to create this graph, therefore I've rewritten the example to just use SGPlot. And while I

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Analytics | Programming Tips

Rick WicklinApril 24, 2019 0

A CUSUM test for autregressive models

The CUSUM test has many incarnations. Different areas of statistics use different assumption and test for different hypotheses. This article presents a brief overview of CUSUM tests and gives an example of using the CUSUM test in PROC AUTOREG for autoregressive models in SAS. A CUSUM test uses the cumulative

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Programming Tips

Chevell ParkerApril 23, 2019 0

Control the location of tables, graphs, and text with ODS Excel

This article demonstrates the ODS Excel destination’s flexibility and how you can modify its default behavior by using the SHEET_INTERVAL= option.

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Data Visualization | Programming Tips

Robert AllisonApril 22, 2019 0

Mortgage rates - overlaying multiple years in the same graph

While we're on the topic of mortgage rates, let's explore another technique for plotting and comparing the rate data over several years. Last time, we plotted each year's data in a separate graph, and paneled them across the page. This time, let's overlay multiple years together in the same graph.

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Banking | Government

Programming Tips

Sian RobertsApril 22, 2019 0

Moving from natural language processing to natural language understanding

Imagine a world where satisfying human-computer dialogues exist. With the resurgence of interest in natural language processing (NLP) and understanding (NLU) – that day may not be far off. In order to provide more satisfying interactions with machines, researchers are designing smart systems that use artificial intelligence (AI) to develop

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Programming Tips

Rick WicklinApril 22, 2019 0

The CUSUM test for randomness of a binary sequence

Many statistical tests use a CUSUM statistic as part of the test. It can be confusing when a researcher refers to "the CUSUM test" without providing details about exactly which CUSUM test is being used. This article describes a CUSUM test for the randomness of a binary sequence. You start

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Programming Tips

Chris Hemedinger

Chris HemedingerApril 19, 2019 0

Deeper enjoyment of your favorite shows -- through data

By using data provided by a Game of Thrones fan, we use SAS to look at screen time for scene locations and characters in this crazy popular show.

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Data Visualization | Programming Tips

Robert AllisonApril 17, 2019 0

Diving deeper into a mortgage rate graph

Did you recently lock in a mortgage rate of 3.5-5%, or perhaps even lower? How do today's rates compare to rates in the past? Let's dig a little deeper into this topic, with some graphs! But before we get started, here's a picture to get you into the mood for

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Banking | Government

Programming Tips

Rick WicklinApril 17, 2019 0

Create your own version of Anscombe's quartet: Dissimilar data that have similar statistics

I think every course in exploratory data analysis should begin by studying Anscombe's quartet. Anscombe's quartet is a set of four data sets (N=11) that have nearly identical descriptive statistics but different graphical properties. They are a great reminder of why you should graph your data. You can read about

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Programming Tips

Suzanne MorgenApril 16, 2019 0

Using code snippets in SAS® Viya®

This blog post is based on the Code Snippets tutorial video in the free SAS® Viya® Enablement course from SAS Education. Keep reading to learn more about code snippets or check out the video to follow along with the tutorial in real-time. Has there ever been a block of code

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Data Visualization | Programming Tips

Robert AllisonApril 15, 2019 0

Does low unemployment mean there are job openings?

In the past, I created some graphs about our record low unemployment rate (US unemployment, and state-level unemployment), but does low unemployment also mean there are jobs available? Let's have a look at the data!... Existing Graphs I knew I couldn't be the only one interested in this kind of

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Government | Manufacturing

Programming Tips

Rick WicklinApril 15, 2019 0

Efficient evaluation of a quadratic form

A quadratic form is a second-degree polynomial that does not have any linear or constant terms. For multivariate polynomials, you can quickly evaluate a quadratic form by using the matrix expression x` A x This computation is straightforward in a matrix language such as SAS/IML. However, some computations in statistics

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Analytics | Data Visualization | Programming Tips | SAS Administrators | SAS Events

Frederik Vandenberghe

Frederik VandenbergheApril 12, 2019 0

Script for a SAS Viya installation on Azure in just one click

At the end of my SAS Users blog post explaining how to install SAS Viya on the Azure Cloud for a SAS Hackathon in the Nordics, I promised to provide some technical background. I ended up with only one manual step by launching a shell script from a Linux machine

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Data Visualization | Programming Tips

Robert AllisonApril 11, 2019 0

What to do in Dallas, during SAS Global Forum!

The past few years, I've created maps showing things you might visit and do during the big SAS Global Forum (SASGF) conference. This year the conference is in Dallas, and ... you guessed it ... I've created a Dallas map! If you're familiar with my previous maps, you know that

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Sports & Entertainment

Programming Tips

Chris Hemedinger

Chris HemedingerApril 11, 2019 0

Read RSS feeds with SAS using XML or JSON

This blog post could be subtitled "To Catch a Thief" or maybe "Go ahead. Steal this blog. I dare you."* That's because I've used this technique several times to catch and report other web sites who lift the blog content from blogs.sas.com and present it as their own. Syndicating blog

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Analytics | Programming Tips

Rick WicklinApril 10, 2019 0

4 ways to compute an SSCP matrix

In numerical linear algebra, there are often multiple ways to solve a problem, and each way is useful in various contexts. In fact, one of the challenges in matrix computations is choosing from among different algorithms, which often vary in their use of memory, data access, and speed. This article

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Learn SAS | Programming Tips | SAS Administrators

Joe FurbeeApril 8, 2019 0

Launching the Developers Community in SAS Communities

As word spreads that SAS integrates with open source technologies, people are beginning to explore how to connect, interact with, and use SAS in new ways. More and more users are examining the possibilities and with this comes questions like: How do I code A, integrate B, and accomplish C?

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Data Visualization | Programming Tips | SAS Events

Robert AllisonApril 8, 2019 0

Hone your graphing skills at SAS Global Forum!

SAS Global Forum 2019 (SGF) is rapidly approaching - and which of the hundreds of presentations are you planning to attend? Well, no matter what types of analyses you perform with SAS software, you'll most likely want to present your findings in a really nice/informative graph! Therefore I highly recommend

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Learn SAS | Programming Tips

Rick WicklinApril 8, 2019 0

Use the FLOOR-MOD trick to allocate items to groups

Suppose you need to assign 100 patients equally among 3 treatment groups in a clinical study. Obviously, an equal allocation is impossible because the second number does not evenly divide the first, but you can get close by assigning 34 patients to one group and 33 to the others. Mathematically,

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Programming Tips

Missy HannahApril 5, 2019 0

SAS® Cloud—an interview with the women involved

Recently, you may have heard about the release of the new SAS Cloud. The platform allows fast access to data-science applications in the cloud! Running on the SAS Cloud and using the latest container technology, SAS Cloud eliminates the need to install, update, or maintain software or related infrastructure. SAS

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Data Visualization | Programming Tips

Robert AllisonApril 3, 2019 0

Are traffic fatalities up, or down?

I recently saw an interesting graph that showed the number of motor vehicle crash deaths has been going down. The graph showed deaths per mile. That's a good statistic, but I wondered whether there were other ways to look at the data? An Interesting Graph Here's the graph, from an

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Insurance | Travel

Learn SAS | Programming Tips

Rick WicklinApril 3, 2019 0

Convergence in mixed models: When the estimated G matrix is not positive definite

I've previously written about how to deal with nonconvergence when fitting generalized linear regression models. Most generalized linear and mixed models use an iterative optimization process, such as maximum likelihood estimation, to fit parameters. The optimization might not converge, either because the initial guess is poor or because the model

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Learn SAS | Programming Tips

Rick WicklinApril 1, 2019 0

Matrix operations and BY groups

Many SAS procedures support the BY statement, which enables you to perform an analysis for subgroups of the data set. Although the SAS/IML language does not have a built-in "BY statement," there are various techniques that enable you to perform a BY-group analysis. The two I use most often are

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