Blogs

Blogs

Programming Tips

Strengthen your programming skills with tips and techniques from the experts

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

Read More

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

Read More

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

Read More

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

Read More

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

Read More

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?

Read More

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

Read More

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,

Read More

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

Read More

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

Read More

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

Read More

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

Read More

Programming Tips

dividing zero with SAS

Leonid BatkhanApril 1, 2019 0

Dividing by zero with SAS

Whether you are a strong believer in the power of dividing by zero, agnostic, undecided, a supporter, denier or anything in between and beyond, this blog post will bring all to a common denominator. History of injustice For how many years have you been told that you cannot divide by

Read More

Analytics | Programming Tips

Deva KumarMarch 26, 2019 0

Serverless functions and SAS Viya - a good match

Also celebrating is your bank's branch manager. She was skeptical when headquarters analysts equipped branches for "Cloud-based application using SAS" , saying it would speed up loan applications. But your quick, frictionless transaction proved them right.The bank's accountants are happy too. The new pay-as-you-go mode of using SAS software in

Read More

Data Visualization | Programming Tips

Robert AllisonMarch 25, 2019 0

Plotting population projections, with a confidence interval

During the year 2020, many countries and areas will be conducting their decennial census, and making projections to estimate what their population will be in the future. Therefore I decided to dust off one of my old SAS/Graph samples based on the 2010 census, and rewrite it using more modern

Read More

Programming Tips

Schematic diagram of outliers in bivariate normal data. The point 'A' has large univariate z scores but a small Mahalanobis distance. The point 'B' has a large Mahalanobis distance. Only 'b' is a multivariate outlier.

Rick WicklinMarch 25, 2019 0

The geometry of multivariate versus univariate outliers

An important concept in multivariate statistical analysis is the Mahalanobis distance. The Mahalanobis distance provides a way to measure how far away an observation is from the center of a sample while accounting for correlations in the data. The Mahalanobis distance is a good way to detect outliers in multivariate

Read More

Data Visualization | Programming Tips

Robert AllisonMarch 20, 2019 0

Is there more flooding than usual this year?

Flooding has been in the news the past few days, and that makes me want to analyze some data! I hang out at Jordan Lake (here in central North Carolina) a lot, so I decided to download the data for that lake, and do a graphical analysis. If you're interested

Read More

Data for Good | Data Visualization | Programming Tips

Robert AllisonMarch 18, 2019 0

How deadly was the flu in 2019?

Here in the US, there's a lot of talk about the flu each year. First, people discuss whether or not to get the flu shot. Then there are discussions about whether or not you or your friends have the flu (or something else). Then the discussions about what strain of

Read More

Programming Tips

Rick WicklinMarch 18, 2019 0

Interpolation vs extrapolation: the convex hull of multivariate data

Statisticians often emphasize the dangers of extrapolating from a univariate regression model. A common exercise in introductory statistics is to ask students to compute a model of population growth and predict the population far in the future. The students learn that extrapolating from a model can result in a nonsensical

Read More

Data Visualization | Learn SAS | Programming Tips

Martin MinceyMarch 15, 2019 0

How to view or create ODS output without causing SAS® to stop responding or run slowly

SAS makes it easy for you to create a large amount of procedure output with very few statements. However, when you create a large amount of procedure output with the Output Delivery System (ODS), your SAS session might stop responding or run slowly. In some cases, SAS generates a “Not

Read More

Data Visualization | Programming Tips

Robert AllisonMarch 14, 2019 0

US ethanol fuel production - a beautiful graph!

US farmers grow a lot of food ... but did you know some of them also grow fuel for our vehicles? Follow along and you'll learn how much fuel they grow, and also learn some tips about plotting this type of data! These days most gasoline in the US has

Read More

Energy & Utilities

Programming Tips

Rick WicklinMarch 13, 2019 0

The value of pi depends on how you measure distance

It's time to celebrate Pi Day! Every year on March 14th (written 3/14 in the US), math-loving folks celebrate "all things pi-related" because 3.14 is the three-decimal approximation to the mathematical constant, π. Although children learn that pi is approximately 3.14159..., the actual definition of π is the ratio of

Read More

Learn SAS | Programming Tips

Rick WicklinMarch 11, 2019 0

How to detect SAS data sets that contain (or do not contain) character variables

A SAS programmer posted an interesting question on a SAS discussion forum. The programmer wanted to iterate over hundreds of SAS data sets, read in all the character variables, and then do some analysis. However, not every data set contains character variables, and SAS complains when you ask it to

Read More

Data for Good | Data Visualization | Programming Tips

Robert AllisonMarch 7, 2019 0

Comparing child poverty around the world

According to the most recent data, the child poverty rate in China is 33.1% - the rate in Denmark is 2.9%. Where do other countries fall in between these two extremes? Let's build a graph and find out! (or, if you're not interested in the code - jump to the

Read More

Programming Tips | SAS Administrators

Joe FurbeeMarch 6, 2019 0

Getting started with SAS Containers

As of December 2018, any customer with a valid SAS Viya order is able to package and deploy their SAS Viya software in Docker containers. SAS has provided a fully documented and supported project (or “recipe”) for easily building these containers. So how can you start? You can simply stop

Read More

Learn SAS | Programming Tips

Leonid BatkhanMarch 5, 2019 0

How to conditionally terminate a SAS batch flow process in UNIX/Linux

In automated production (or business operations) environments, we often run SAS job flows in batch mode and on schedule. SAS job flow is a collection of several inter-dependent SAS programs executed as a single process. In my earlier posts, Running SAS programs in batch under Unix/Linux and Let SAS write

Read More

Data Visualization | Programming Tips

Robert AllisonFebruary 19, 2019 0

Graphing cardiovascular disease mortality data

I have written several blog posts about longevity, and here is another one related to that topic. Cardiovascular disease (cvd) is one of the more common causes of death, and I was wondering how those numbers have changed over time. Are fewer people dying from cvd, or are more people

Read More

Programming Tips

Rick WicklinFebruary 18, 2019 0

An easier way to perform regression with restricted cubic splines in SAS

Maybe if we think and wish and hope and pray It might come true. Oh, wouldn't it be nice? The Beach Boys Months ago, I wrote about how to use the EFFECT statement in SAS to perform regression with restricted cubic splines. This is the modern way to use splines

Read More

Data Visualization | Learn SAS | Programming Tips

Martin MinceyFebruary 15, 2019 0

Embed scalable graphics using the ODS HTML5 destination

Beginning with SAS® 9.4, you can embed graphics output within HTML output using the ODS HTML5 destination. This technique works with SAS/GRAPH® procedures (such as GPLOT and GCHART), SG procedures (such as SGPLOT and SGRENDER), and when you create graphics output with ODS Graphics enabled. Most (if not all) existing

Read More

Previous 1 … 27 28 29 30 31 … 66 Next