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Analytics | Learn SAS | Programming Tips

Rick WicklinMarch 22, 2023 0

Partial correlation: controlling for confounding variables

A data analyst wanted to estimate the correlation between two variables, but he was concerned about the influence of a confounding variable that is correlated with them. The correlation might affect the apparent relationship between main two variables in the study. A common confounding variable is age because young people

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Learn SAS | Programming Tips

Rick WicklinMarch 20, 2023 0

Estimate a Markov transition matrix from historical data

In a previous article about Markov transition matrices, I mentioned that you can estimate a Markov transition matrix by using historical data that are collected over a certain length of time. A SAS programmer asked how you can estimate a transition matrix in SAS. The answer is that you can

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Analytics | Learn SAS | Programming Tips

Rick WicklinMarch 15, 2023 0

Fitting a distribution to an expert's opinion: An application of the metalog distribution

Most homeowners know that large home improvement projects can take longer than you expect. Whether it's remodeling a kitchen, adding a deck, or landscaping a yard, big projects are expensive and subject to a lot of uncertainty. Factors such as weather, the availability of labor, and the supply of materials,

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Analytics | Learn SAS | Programming Tips

Rick WicklinMarch 13, 2023 0

Use the metalog distribution in SAS

A previous article describes the metalog distribution (Keelin, 2016). The metalog distribution is a flexible family of distributions that can model a wide range of shapes for data distributions. The metalog system can model bounded, semibounded, and unbounded continuous distributions. This article shows how to use the metalog distribution in

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Learn SAS | Programming Tips

Rick WicklinMarch 8, 2023 0

How Newton calculated pi to 16 decimal places

Happy Pi Day! Every year on March 14th (written 3/14 in the US), people in the mathematical sciences celebrate "all things pi-related" because 3.14 is the three-decimal approximation to π ≈ 3.14159265358979.... Modern computer methods and algorithms enable us to calculate 100 trillion digits of π. However, I think it

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Learn SAS | Programming Tips

Rick WicklinMarch 6, 2023 0

The variance of the sums of variables

Undergraduate textbooks on probability and statistics typically prove theorems that show how the variance of a sum of random variables is related to the variance of the original variables and the covariance between them. For example, the Wikipedia article on Variance contains an equation for the sum of two random

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Analytics | Learn SAS | Programming Tips

Rick WicklinFebruary 20, 2023 0

Simulate from a bounded distribution that has a specified mean

A SAS programmer asked for help to simulate data from a distribution that has certain properties. The distribution must be supported on the interval [a, b] and have a specified mean, μ, where a < μ < b. It turns out that there are infinitely many distributions that satisfy these

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Advanced Analytics | Analytics | Artificial Intelligence | Data for Good | Learn SAS | Students & Educators

Ricardo Galante

Ricardo GalanteFebruary 16, 2023 0

História do SAS LAB na Faculdade de Ciências da Universidade de Lisboa

Origem e benefícios do Laboratório Científico criado pelo SAS, na Faculdade de Ciências da Universidade de Lisboa. No final do ano passado, o SAS Portugal anunciou a criação de um laboratório científico - designado SAS-FCUL Lab - na FCUL - Faculdade de Ciências da Universidade de Lisboa, com o objetivo

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Data Visualization | Learn SAS | Programming Tips

Rick WicklinFebruary 8, 2023 0

A random walk inside a heart

SAS programmers love to make special graphs for Valentine's Day. In fact, there is a long history of heart-shaped graphs and love-inspired programs written in SAS! Last year, I added to the collection by showing how a ball bounces on a heart-shaped billiards table. This year, I create a similar

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Learn SAS | Programming Tips

Rick WicklinFebruary 6, 2023 0

How to use Git to share SAS programs

This article is about how to use Git to share SAS programs, specifically how to share libraries of SAS IML functions. Some IML programmers might remember an earlier way to share libraries of functions: SAS/IML released "packages" in SAS 9.4m3 (2015), which enable you to create, document, share, and use

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Data Visualization | Learn SAS | Programming Tips

Rick WicklinFebruary 1, 2023 0

Colorblind-safe palettes in SAS

SAS supports the ColorBrewer system of color palettes from the ColorBrewer website (Brewer and Harrower, 2002). The ColorBrewer color ramps are available in SAS by using the PALETTE function in SAS IML software. The PALETTE function supports all ColorBrewer palettes, but some palettes are not interpretable by people with color

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Data Visualization | Learn SAS | Programming Tips

Rick WicklinJanuary 30, 2023 0

Tips for making colorblind-safe statistical graphs

Did you know that about 8% of the world's men are colorblind? (More correctly, 8% of men are "color vision deficient," since they see colors, but not all colors.) Because of the "birthday paradox," in a room that contains eight men, the probability is 50% that at least one is

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Learn SAS | Programming Tips

Rick WicklinJanuary 25, 2023 0

Write to the log from SAS IML programs

I previously discussed how to use the PUTLOG statement to write a message from the DATA step to the log in SAS. The PUTLOG statement is commonly used to write notes, warnings, and errors to the log. This article shows how to use the PRINTTOLOG subroutine in SAS IML software

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Learn SAS | Students & Educators

鈴木徳太January 24, 2023 0

SAS® OnDemand for Academicsがリニューアルしました

2023年を迎えて間も無く1ヶ月が経とうとしていますが、皆様はどのよう新年のスタートをされましたでしょうか。With コロナに向けた取り組みが社会的には広がり、自らが管理する時間が増えた中で、質の良い学習時間を確保することは社会人・学生問わず大変重要なことかと思います。さて、SASでは学習および教育を目的とする方向けに、SAS® OnDemand for Academics (ODA) というアナリティクス・ソフトウェアを無料で提供しています。実は、このSAS ODAですが昨年末にログイン画面のアップグレードが行われ、提供されている各種機能へのアクセス方法がわかりやすくなりました。このブログ記事では、アップグレード後の SAS ODAについて紹介していきます。 ①ホーム画面（中央）画面中央には大きく3つのセクションがあり、それぞれ下記の内容が提供されています。 Code with SAS® Studio すべての教員・学生・個人学習者を対象として、Webサイトにアクセスするだけで使用可能です提供されている”タスク”からGUI的にSASコードを生成可能です（もちろん自分でコーディングすることも可能） SAS Studio上にプログラムファイルの新規作成、既存ファイルのアップロードが可能です（最大5GB）アクセス可能なSASソフトウェア一覧： SAS/STAT® Base SAS® SAS/IML® SAS/OR® SAS/QC® SAS/ETS® Learn SAS Programming Programming 1, Statistics 1といった統計学やプログラミングに関するいくつかのe-learningや、動画教材を提供しています SASソフトウェアや統計解析・機械学習を中心とした基礎的な知識、スキルをe-learningを通じて習得可能なオンライン学習プラットフォームSAS Skill Builder for Studentsを学生を対象として提供しています（大学ドメインのアドレスが必要） SASの認定資格に関するガイドをていきょうしています Collaborate with SAS Communities いくつかのSASに関連するコミュニティ情報が掲載されていますプログラミングや解析にあたっての疑問点、Tipsを共有し、世界中のSASユーザーからコメントをもらうことが可能です ②ホーム画面（右）初期状態では次の5つのアイコンが表示されます。 Files

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Learn SAS | Programming Tips

Rick WicklinJanuary 23, 2023 0

Use the PUTLOG statement to write errors, warning, and notes to the SAS log

Many experienced SAS programmers use the PUT statement to write messages to the log from a DATA step. But did you know that SAS supports the PUTLOG function, which is another way to write a message to the log? I use the PUTLOG statement in the DATA step for the

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Analytics | Data Visualization | Learn SAS

Rick WicklinJanuary 18, 2023 0

Visualize how parameters in a binary logistic regression model affect the probability of the event

A previous article shows that you can use the Intercept parameter to control the ratio of events to nonevents in a simulation of data from a logistic regression model. If you decrease the intercept parameter, the probability of the event decreases; if you increase the intercept parameter, the probability of

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Analytics | Learn SAS | Programming Tips

Rick WicklinJanuary 11, 2023 0

12 blog posts from 2022 that deserve a second look

In a previous article, I presented some of the most popular blog posts from 2022. In general, popular articles deal with elementary topics that have broad appeal. However, I also write articles about advanced topics. The following articles didn't make the Top 10 list, but they deserve a second look.

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Learn SAS | SAS Administrators

Kelly HansonJanuary 4, 2023 0

New certification alert: SAS® Certified Specialist: Administration of SAS® Viya®

Thank you to my co-author Raymond Thomas for his assistance on this post. Learn more about the SAS Certified Specialist: Administration of SAS Viya and how to prepare. Certification overview SAS is pleased to announce a new SAS Viya Administration certification. Recognizing the growing need of cloud computing and Kubernetes,

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Analytics | Learn SAS | Programming Tips

Rick WicklinJanuary 4, 2023 0

Top 10 posts from The DO Loop in 2022

Last year, I wrote almost 90 articles for The DO Loop blog. My most popular articles were about SAS programming, data visualization, statistics and data analysis, and matrix computations. If you missed these articles when I published them—or if you want to read them again!— here is the "Reader's Choice

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Learn SAS | SAS Events

Lexi RegaladoDecember 23, 2022 0

SAS training: 5 free sessions technologists love

SAS Explore was created by technologists for technologists, and has more than 100 free SAS training sessions. Here are a few top picks!

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Learn SAS | Programming Tips

Rick WicklinDecember 19, 2022 0

Working with combinations in SAS

A colleague posted a Christmas-themed code snippet that shows how to use the DATA step in SAS to output all the possible ways that Santa can hitch up a team of reindeer to pull his sled. The assumption is that Rudolph must lead the team, and the remaining reindeer are

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Analytics | Learn SAS | Students & Educators

Naohiro Takemura (竹村尚大)December 16, 2022 0

まず「データリテラシー」からはじめよう

社会でのデータ活用が進むにつれ、それを推進する人材の必要性が増しています。データ活用人材、アナリティクス人材、データサイエンティスト、呼び方や役割はさまざまですが、そのスキルの根底にあるのは、「データリテラシー」です。データリテラシーとは、世界で起こっているさまざまなことを理解するために、データと対話できることを指します。データの有用性を見極め、信頼性を問い、意味を見出し、その洞察を意思決定に役立て、洞察を他者に伝えることができる一連のスキルです。内閣府、文部科学省、経済産業省は、大学における「リテラシーレベル」の数理・データサイエンス・AI教育プログラムについて、認定制度をはじめようとしています。 SASは、学生向けにデータサイエンスを学べる SAS Skill Builder for Students を無料で提供しています。Skill Builder for Students の e-Learning のなかに、データサイエンスを学ぶ最初のコースとして、Data Literacy Essential があります。このコースでは、身近な例を取り上げ、段階を踏んでわかりやすくデータリテラシーについて学ぶことができます。 SASは、アナリティクスが個人や組織の意思決定のために活用されるものであることを意識し、製品やサービスを展開しています。この Data Literacy Essential のコースでも、意思決定の際にデータとどう向き合えばよいのか、その理解のためのファースト・ステップを提供します。よく統計学の初級コースで、「まず平均や分散を計算してみましょう」という教材がありますが、実は、それ以前に理解すべきことがあります。なぜデータを見る必要があるのか、どのようにデータを集めるのか、そのデータはどういう性質を持っているのか、という疑問と、それらを知ろうとする姿勢が必要です。このコースは6つのモジュールで構成されます。 Why Data Literacy Matters ... WebやSNSなどで出会うさまざまなデータを例にデータリテラシーの重要性を学びます。 Data Literacy Practices ... 商品の購入を例にデータリテラシーの実践を学びます。 Identifying Reliable Data ... ある家族の新型コロナ感染予防の取り組みを例に信頼できるデータの収集について学びます。 Discovering the Meaning of Data ... 新型コロナの影響を受けたビジネスを例にデータから知見をどのように得られるのかを学びます。 Making Data-informed Decisions ...

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Analytics | Learn SAS | Programming Tips

ARH(1) covariance structure

Rick WicklinDecember 14, 2022 0

Construct heterogeneous structured covariance matrices in SAS

A previous article describes how to use SAS IML software to construct common covariance structures that are encountered in mixed models. Each covariance matrix has several parameters, and you want to construct a matrix for any choice of the parameters. After you have constructed the covariance matrix, you can use

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Advanced Analytics | Analytics | Artificial Intelligence | Cloud | Learn SAS | Machine Learning | SAS Events

Charlie ChaseDecember 13, 2022 0

Solving 3 emerging challenges for retail and consumer goods supply chains

The landscape of supply chains has changed rapidly due to unforeseen disruptions. These changes include supply chain bottlenecks, inflation and geopolitical activities across retail and consumer goods industries. Retail supply chains are under immense pressure to keep up with these rapid changes. Innovators have been quick to take advantage of

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AgTech | Manufacturing | Retail

Learn SAS | Programming Tips

Rick WicklinDecember 12, 2022 0

Properties of the Hadamard product

I always emphasize efficiency in statistical programming. I have previously written about why you should never multiply with a large diagonal matrix in the SAS IML language. The reason is that it is more efficient to use elementwise multiplication than matrix multiplication. Specifically, if d is a column vector, then

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Data Visualization | Learn SAS | Programming Tips

Rick WicklinDecember 7, 2022 0

Art in SAS: Christmas wrapping paper

For Christmas 2021, I wrote an article about palettes of Christmas colors, chiefly shades of red, green, silver, and gold. One of my readers joked that she would like to use my custom palette to design her own Christmas wrapping paper! I remembered her jest when I saw some artwork

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Learn SAS | Programming Tips

Rick WicklinNovember 30, 2022 0

Ladders: A probabilistic card trick

A probabilistic card trick is a trick that succeeds with high probability and does not require any skill from the person performing the trick. I have seen a certain trick mentioned several times on social media. I call it "ladders" or the "ladders game" because it reminds me of the

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Advanced Analytics | Analytics | Artificial Intelligence | Learn SAS | Students & Educators

Jos van DongenNovember 28, 2022 0

SAS Energy Game: Serious gaming maakt leren leuk

Inzicht krijgen in de kracht van analytics én leren omgaan met analytische software. En dat terwijl je gewoon een spel speelt. Dat is de SAS Energy Game. Inmiddels hebben al honderden studenten het spel gespeeld en daarmee hun analytische vaardigheden versterkt. Meer mensen kennis laten maken met analytics Data is

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Energy & Utilities

Learn SAS | Programming Tips

Rick WicklinNovember 28, 2022 0

Simulate poker hands in SAS

A SAS programmer was trying to simulate poker hands. He was having difficulty because the sampling scheme for simulating card games requires that you sample without replacement for each hand. In statistics, this is called "simple random sampling." If done properly, it is straightforward to simulate poker hands in SAS.

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Data Visualization | Learn SAS | Programming Tips

Rick WicklinNovember 14, 2022 0

Profile plots in SAS

A profile plot is a compact way to visualize many variables for a set of subjects. It enables you to investigate which subjects are similar to or different from other subjects. Visually, a profile plot can take many forms. This article shows several profile plots: a line plot of the

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