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Learn SAS

Learn about the latest tips, tutorials, upcoming events and certifications

Analytics | Learn SAS | SAS Events

Tricia JenkinsFebruary 13, 2020 0

Experience SAS Global Forum: A First-Timer’s View & Tip Sheet

If you’re a SAS user, you know that SAS Global Forum is where you want to be! It’s our premier, can’t-miss event for SAS professionals—that includes thousands of users, executives, partners and academics. It’s also our largest users’ event, organized by users, for users, and this year’s event marks our

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Analytics | Learn SAS | Programming Tips

Rick WicklinFebruary 12, 2020 0

The Johnson system: Which distribution should you choose to model data?

The Johnson system (Johnson, 1949) contains a family of four distributions: the normal distribution, the lognormal distribution, the SB distribution, and the SU distribution. Previous articles explain why the Johnson system is useful and show how to use PROC UNIVARIATE in SAS to estimate parameters for the Johnson SB distribution

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Learn SAS | Programming Tips

Rick WicklinFebruary 10, 2020 0

Find the fractional part of a number

You can represent every number as a nearby integer plus a decimal. For example, 1.3 = 1 + 0.3. The integer is called the integer part of x, whereas the decimal is called the fractional part of x (or sometimes the decimal part of x). This representation is not unique.

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Analytics | Data Visualization | Learn SAS

Rick WicklinFebruary 5, 2020 0

Visualize residual projections for linear regression

A SAS programmer wanted to create a graph that illustrates how Deming regression differs from ordinary least squares regression. The main idea is shown in the panel of graphs below. The first graph shows the geometry of least squares regression when we regress Y onto X. ("Regress Y onto X"

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Analytics | Learn SAS

Rick WicklinJanuary 29, 2020 0

Collinearity diagnostics: Should the data be centered?

In a previous article, I showed how to perform collinearity diagnostics in SAS by using the COLLIN option in the MODEL statement in PROC REG. For models that contain an intercept term, I noted that there has been considerable debate about whether the data vectors should be mean-centered prior to

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Learn SAS | Programming Tips

Leonid BatkhanJanuary 27, 2020 0

Shifting a date by a given number of workdays

This blog post demonstrates process and SAS coding techniques to shift dates by a given number of workdays accounting for weekends and holidays.

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Learn SAS | SAS Events

Shelley Sessoms

Shelley SessomsJanuary 23, 2020 0

Make the most of SAS Global Forum with the session catalog

When I attend a conference, one of the first things I do is look at the agenda. This gives me a good overview of how my time will be spent. The next thing I do is find the detailed breakdown of sessions, so I can start building out my own

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Analytics | Learn SAS

Rick WicklinJanuary 23, 2020 0

Collinearity in regression: The COLLIN option in PROC REG

I was recently asked about how to interpret the output from the COLLIN (or COLLINOINT) option on the MODEL statement in PROC REG in SAS. The example in the documentation for PROC REG is correct but is somewhat terse regarding how to use the output to diagnose collinearity and how

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Learn SAS | Programming Tips

Suzanne MorgenJanuary 13, 2020 0

Foresight is 2020! New books to take your skills to the next level

Are you ready to get a jump start on the new year? If you’ve been wanting to brush up your SAS skills or learn something new, there’s no time like a new decade to start! SAS Press is releasing several new books in the upcoming months to help you stay

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Analytics | Learn SAS

Rick WicklinJanuary 8, 2020 0

3 ways to add confidence limits to regression curves in SAS

Many SAS procedures can automatically create a graph that overlays multiple prediction curves and their prediction limits. This graph (sometimes called a "fit plot" or a "sliced fit plot") is useful when you want to visualize a model in which a continuous response variable depends on one continuous explanatory variable

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Data Visualization | Learn SAS | Programming Tips

Rick WicklinJanuary 6, 2020 0

Top posts from The DO Loop in 2019

Last year, I wrote more than 100 posts for The DO Loop blog. The most popular articles were about SAS programming tips for data analysis, statistical analysis, and data visualization. Here are the most popular articles from 2019 in each category. SAS programming tips Create training, testing, and validation data

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Learn SAS | Programming Tips

Sian RobertsDecember 17, 2019 0

How many people does it take to publish a book?

The next time you pick up a book, you might want to pause and think about the work that has gone into producing it – and not just from the authors.

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Analytics | Learn SAS | Machine Learning | Programming Tips

Nelson Grajales

Nelson GrajalesDecember 11, 2019 0

Adding SAS® procedures to the SASPy interface to Python

Bringing the power of SAS to your Python scripts can be a game changer. An easy way to do that is by using SASPy, a Python interface to SAS allowing Python developers to use SAS® procedures within Python. However, not all SAS procedures are included in the SASPy library. So,

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Learn SAS | Programming Tips

Kim WilsonDecember 10, 2019 0

Old reliable: DATA step tips and tricks

The DATA step remains a popular way to create and manipulate SAS data sets. Whether you are reshaping a data set entirely or simply assigning values to a new variable, there are numerous tips and tricks that you can use to save time and keystrokes.

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Data Visualization | Learn SAS | Programming Tips

Leonid BatkhanDecember 9, 2019 0

How to compare SAS data tables for common/uncommon columns

SAS' Leonid Batkhan shows you how to compare SAS data sets that include common and uncommon columns. You'll learn how to check mark commonalities and color-code differences in data tables side-by-side columns and add a comments field to see greater detail.

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Data Visualization | Learn SAS

Rick WicklinDecember 9, 2019 0

Visualize data before and after a treatment

Recently I showed how to visualize and analyze longitudinal data in which subjects are measured at multiple time points. A very common situation is that the data are collected at two time points. For example, in medicine it is very common to measure some quantity (blood pressure, cholesterol, white-blood cell

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Learn SAS | Programming Tips

Shelley Sessoms

Shelley SessomsDecember 4, 2019 0

Gifts to give the SAS fan in your life

If you’re like me, you struggle to buy gifts. Most folks in my inner circle already have everything they need and most of what they want. Most folks, that is, except the tech-lovers. That’s because there’s always something new on the horizon. There’s always a new gadget or program. Or

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Learn SAS | Programming Tips

Samantha Gidlow

Samantha GidlowNovember 25, 2019 0

Are you a SAS certified professional?

The SAS Global Certification Program started in 1999 and has issued over 150,000 credentials to SAS users. Today, the program offers 23 different credentials across seven categories.

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Analytics | Learn SAS

Rick WicklinNovember 20, 2019 0

Predicted values in generalized linear models: The ILINK option in SAS

In a linear regression model, the predicted values are on the same scale as the response variable. You can plot the observed and predicted responses to visualize how well the model agrees with the data, However, for generalized linear models, there is a potential source of confusion. Recall that a

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Learn SAS | Programming Tips

Ron CodyNovember 12, 2019 0

Testing the Assumption of Normality for Parametric Tests

The t-test is a very useful test that compares one variable (perhaps blood pressure) between two groups. T-tests are called t-tests because the test results are all based on t-values. T-values are an example of what statisticians call test statistics. A test statistic is a standardized value that is calculated

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Learn SAS | Programming Tips

Rick WicklinNovember 11, 2019 0

Round to even

In grade school, students learn how to round numbers to the nearest integer. In later years, students learn variations, such as rounding up and rounding down by using the greatest integer function and least integer function, respectively. My sister, who is an engineer, learned a rounding method that rounds half-integers

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Learn SAS | Programming Tips

Ron CodyNovember 6, 2019 0

Making your SAS code more readable

Learn about best-selling SAS author Ron Cody's programming standards.

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Analytics | Data Visualization | Learn SAS

Rick WicklinNovember 4, 2019 0

How to interpret graphs in a principal component analysis

Understanding multivariate statistics requires mastery of high-dimensional geometry and concepts in linear algebra such as matrix factorizations, basis vectors, and linear subspaces. Graphs can help to summarize what a multivariate analysis is telling us about the data. This article looks at four graphs that are often part of a principal

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Learn SAS | Programming Tips

Joe FurbeeOctober 31, 2019 0

Append tables in SAS® Viya® with REST APIs – a treat, no tricks

While growing up in the 80's, I watched The Golden Girls on TV with my Grandma Betty. Now, when my sister visits, we binge watch reruns on TV Land. I was excited when I saw for this Halloween, you could buy Golden Girls costumes! Too bad they sold out right

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Learn SAS | Programming Tips

Rick WicklinOctober 30, 2019 0

Compute the first or last day of a month or year

Every year at Halloween, I post an article that shows a SAS trick that is a real treat. This article shows how to use the INTNX function to find dates that are related to a specified date. The INTNX function is a sweet treat, indeed. I previously wrote an article

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Data Visualization | Learn SAS | Programming Tips

Leonid BatkhanOctober 30, 2019 0

How to create checklist tables in SAS®

Leonid Batkhan shows you easy ways to create a checklist table in SAS software.

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Learn SAS | Programming Tips

Susan SlaughterOctober 29, 2019 0

The Little SAS Book 6.0: The best-selling SAS book gets even better

Find out about the changes and enhancements to the best-selling book, The Little SAS Book.

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Learn SAS | Programming Tips

Rick WicklinOctober 28, 2019 0

Use regular expressions to specify variable names in SAS

A common task in SAS programming is to specify a list of variables that satisfy some pattern. You can specify lists for the KEEP= or DROP= data set options, and you can use lists of variables on many SAS statements such as the VAR and MODEL statements. Although SAS has

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Analytics | Data Visualization | Learn SAS

Rick WicklinOctober 21, 2019 0

Compute and visualize binomial proportions in SAS

Computing rates and proportions is a common task in data analysis. When you are computing several proportions, it is helpful to visualize how the rates vary among subgroups of the population. Examples of proportions that depend on subgroups include: Mortality rates for various types of cancers Incarceration rates by race

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Analytics | Learn SAS

Rick WicklinOctober 14, 2019 0

Compute the geometric mean for many variables in SAS

I recently wrote about how to use PROC TTEST in SAS/STAT software to compute the geometric mean and related statistics. This prompted a SAS programmer to ask a related question. Suppose you have dozens (or hundreds) of variables and you want to compute the geometric mean of each. What is

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