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Learn SAS

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

Learn SAS | Programming Tips

Ron CodyMay 25, 2021 0

Reordering rows and columns in a 2x2 table with SAS® Studio Tasks

In SAS Studio, the ordering of rows and columns in the Table Analysis task are, by default, arranged by the internal ordering of the values used in the table. The table arranges the variables alphabetically or numerically by increasing value. For example, traditional coding uses 1 for Yes and 0

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Learn SAS

Rick WicklinMay 24, 2021 0

How to quickly find documentation for a SAS procedure

I refer to the SAS documentation every day. Usually, I want information about SAS syntax and the statistical formulas and algorithms for various options and statements. Although I have bookmarked common documentation books and chapters, sometimes it is easier to perform an internet search to find information. I've discovered a

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Learn SAS | SAS Events | Students & Educators

Trent SmithMay 20, 2021 0

SAS honors educators and students for excellence in analytics and data science

The demand for people with analytics and data science skills continues to outpace supply – and SAS skills are among the most prized. Through programs such as the new  SAS Academic Specialization, the company is building a sustainable pool of data science and analytics talent. At the virtual SAS Global Forum 2021, the company recognized

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Advanced Analytics | Analytics | Data Management | Learn SAS

Victoria SilvaMay 19, 2021 0

Em sessão de demonstração, Brett Wujek mostra como o AutoML pode facilitar os negócios

Brett Wujek, Principal Product Manager do SAS, mostrou detalhadamente o cliclo analítico e como o SAS Viya ajuda a facilitar o modo como os dados podem ser tratados, oferecendo um equilíbrio natural e efetivo entre os recursos de automação e a interação humana. Wujek frisou a importância da interação humana

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Brazilian Portuguese

Learn SAS | Programming Tips

Rick WicklinMay 19, 2021 0

Implement a product function in SAS

A SAS programmer noticed that there is not a built-in function in the SAS DATA step that computes the product for each row across a specified set of variables. There are built-in functions for various statistics such as the SUM, MAX, MIN, MEAN, and MEDIAN functions. But no DATA step

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Analytics | Learn SAS

Rick WicklinMay 17, 2021 0

Standardized regression coefficients in PROC GLIMMIX

I previously wrote about how to understand standardized regression coefficients in PROC REG in SAS. You can obtain the standardized estimates by using the STB option on the MODEL statement in PROC REG. Several readers have written to ask whether I could write a similar article about the STDCOEF option

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Analytics | Learn SAS | Programming Tips

Rick WicklinMay 12, 2021 0

Nonstandard ways to standardize variables

You can standardize a numerical variable by subtracting a location parameter from each observation and then dividing by a scale parameter. Often, the parameters depend on the data that you are standardizing. For example, the most common way to standardize a variable is to subtract the sample mean and divide

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Learn SAS | Programming Tips

Rick WicklinMay 10, 2021 0

Odani's truism for fractions that are near each other

Odani's truism is a mathematical result that says that if you want to compare the fractions a/b and c/d, it often is sufficient to compare the sums (a+d) and (b+c) rather than the products a*d and b*c. (All of the integers a, b, c, and d are positive.) If you

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Learn SAS | Programming Tips

Rick WicklinMay 5, 2021 0

Odani's truism: A probabilistic way to compare fractions

Quick! Which fraction is bigger, 40/83 or 27/56? It's not always easy to mentally compare two fractions to determine which is larger. For this example, you can easily see that both fractions are a little less than 1/2, but to compare the numbers you need to compare the products 40*56

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Analytics | Learn SAS

Rick WicklinMay 3, 2021 0

Examples of using the Hoeffding D statistic

A previous article discusses the definition of the Hoeffding D statistic and how to compute it in SAS. The letter D stands for "dependence." Unlike the Pearson correlation, which measures linear relationships, the Hoeffding D statistic tests whether two random variables are independent. Dependent variables have a Hoeffding D statistic

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Learn SAS | Programming Tips

Rick WicklinApril 26, 2021 0

On passing a list to a SAS/IML module

SAS/IML programmers often create and call user-defined modules. Recall that a module is a user-defined subroutine or function. A function returns a value; a subroutine can change one or more of its input arguments. I have written a complete guide to understanding SAS/IML modules, which contains many tips for working

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Analytics | Learn SAS

Rick WicklinApril 21, 2021 0

Compute bivariate ranks

Ranking is a fundamental concept in statistics. Ranks of univariate data are used by statisticians to estimate statistics such as percentiles (quantiles) and empirical distributions. A more advanced use is to compute various rank-based measures of correlation or association between pairs of variables. For example, ranks are used to compute

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Analytics | Learn SAS

Rick WicklinApril 19, 2021 0

Compute tied ranks

The ranks of a set of data values are used in many nonparametric statistics and statistical tests. When you request a statistic or nonparametric test in SAS, the procedure will automatically compute the ranks that are needed. However, sometimes it is useful to know how to compute the ranks yourself.

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Data Visualization | Learn SAS

Rick WicklinApril 14, 2021 0

Overlay other graphs on a bar chart with PROC SGPLOT

It can be frustrating to receive an error message from statistical software. In the early days of the SAS statistical graphics (SG) procedures, an error message that I dreaded was ERROR: Attempting to overlay incompatible plot or chart types. This error message appears when you attempt to use PROC SGPLOT

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Data Visualization | Learn SAS

Rick WicklinApril 12, 2021 0

3 reasons to prefer a horizontal bar chart

Most introductory statistics courses introduce the bar chart as a way to visualize the frequency (counts) for a categorical variable. A vertical bar chart places the categories along the horizontal (X) axis and shows the counts (or percentages) on the vertical (Y) axis. The vertical bar chart is a precursor

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Data Visualization | Learn SAS

Rick WicklinMarch 29, 2021 0

Identify influential observations in regression models

A previous article discusses how to interpret regression diagnostic plots that are produced by SAS regression procedures such as PROC REG. In that article, two of the plots indicate influential observations and outliers. Intuitively, an observation is influential if its presence changes the parameter estimates for the regression by "more

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Learn SAS | Programming Tips

Leonid BatkhanMarch 24, 2021 0

How to conditionally stop SAS code execution and gracefully terminate SAS session

SAS' Leonid Batkhan reveals a fuss-free way to halt SAS program execution and terminate SAS session in batch-processing scenarios.

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Analytics | Learn SAS

Rick WicklinMarch 24, 2021 0

An overview of regression diagnostic plots in SAS

When you fit a regression model, it is useful to check diagnostic plots to assess the quality of the fit. SAS, like most statistical software, makes it easy to generate regression diagnostics plots. Most SAS regression procedures support the PLOTS= option, which you can use to generate a panel of

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Learn SAS | Programming Tips

Leonid BatkhanMarch 15, 2021 0

How to conditionally execute SAS global statements

SAS' Leonid Batkhan reveals coding techniques that give you control of when and whether global statements are executed.

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Analytics | Data Visualization | Learn SAS

Rick WicklinMarch 8, 2021 0

The conditional distribution of a response variable

I recently learned about a new feature in PROC QUANTREG that was added in SAS/STAT 15.1 (part of SAS 9.4M6). Recall that PROC QUANTREG enables you to perform quantile regression in SAS. (If you are not familiar with quantile regression, see an earlier article that describes quantile regression and provides

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Learn SAS | Programming Tips

Rick WicklinMarch 3, 2021 0

Convert decimals to fractions in SAS

I have previously shown how you can use the FRACTw. format in SAS to display numbers as fractions. But did you know that you can also use the format to obtain the numerator and denominator of the fraction as numbers in a program? All you need to do is to

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Data Visualization | Learn SAS | Programming Tips

Rick WicklinMarch 1, 2021 0

Create a wind chill chart in SAS

I recently wrote about a simple statistical formula that approximates the wind chill temperature, which is the cumulative effect of air temperature and wind on the human body. The formula uses two independent variables (air temperature and wind speed) to predict the wind chill temperature. This article describes how to

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Learn SAS | SAS Events

Dina DuhonFebruary 25, 2021 0

What makes SAS Global Forum great?

The people, the energy, the quality of the content, the demos, the networking opportunities…whew, all of these things combine to make SAS Global Forum great every year. And that is no exception this year. Preparations are in full swing for an unforgettable conference. I hope you’ve seen the notifications that

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Learn SAS | Programming Tips

Leonid BatkhanFebruary 22, 2021 0

Deleting a substring from a SAS string

SAS' Leonid Batkhan shows you how to delete a substring from a character string - one of the common character data manipulation tasks.

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Data Visualization | Learn SAS | Programming Tips

Rick WicklinFebruary 22, 2021 0

How to use the #BYVAR and #BYVAL keywords to customize graph titles in SAS

A previous article describes how to use the SGPANEL procedure to visualize subgroups of data. It focuses on using headers to display information about each graph. In the example, the data are time series for the price of several stocks, and the headers include information about whether the stock price

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Data Visualization | Learn SAS

Rick WicklinFebruary 17, 2021 0

Data-driven titles for graphs

Many characteristics of a graph are determined by the underlying data at run time. A familiar example is when you use colors to indicate different groups in the data. If the data have three groups, you see three colors. If the data have four groups, you see four colors. The

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Learn SAS | Programming Tips

Leonid BatkhanFebruary 15, 2021 0

Inserting a substring into a SAS string

SAS' Leonid Batkhan demonstrates a common character data manipulation task of inserting a substring into a character string.

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Learn SAS | Programming Tips

Rick WicklinFebruary 15, 2021 0

Generate all quadratic interactions in a regression model

I've previously written about how to generate all pairwise interactions for a regression model in SAS. For a model that contains continuous effects, the easiest way is to use the EFFECT statement in PROC GLMSELECT to generate second-degree "polynomial effects." However, a SAS programmer was running a simulation study and

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Learn SAS | Programming Tips

Rick WicklinFebruary 10, 2021 0

Print the top rows of your SAS data

One of the first things I learned in SAS was how to use PROC PRINT to display parts of a data set. I usually do not need to see all the data, so my favorite way to use PROC PRINT is to use the OBS= data set option to display

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Learn SAS | Programming Tips

Kim ChantalaFebruary 1, 2021 0

Creating codebooks with SAS macros

SAS Press author Kim Chantala shows you how to to spend less time preparing data so you can lavish time on analysis.

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