Do you need to see how long patients have been treated for? Would you like to know if a patient’s dose has changed, or if the patient experienced any dose interruptions? If so, you can use a Napoleon plot, also known as a swimmer plot, in conjunction with your exposure […]
How to create a Napoleon plot with Graph Template Language (GTL) was published on SAS Users.
The following is an excerpt from Cautionary Tales in Designed Experiments by David Salsburg. This book is available to download for free from SAS Press. The book aims to explain statistical design of experiments (DOE) to readers with minimal mathematical knowledge and skills. In this excerpt, you will learn about […]
Thomas Bayes’ theorem and “inverse probability” was published on SAS Users.
Decision trees are a fundamental machine learning technique that every data scientist should know. Luckily, the construction and implementation of decision trees in SAS is straightforward and easy to produce. There are simply three sections to review for the development of decision trees: Data Tree development Model evaluation Data The […]
Build a decision tree in SAS was published on SAS Users.
The most fundamental concept that students learning introductory SAS programming must master is how SAS handles data. This might seem like an obvious statement, but it is often overlooked by students in their rush to produce code that works. I often tell my class to step back for a moment […]
Learning to think like SAS was published on SAS Users.
In my new book, End-to-End Data Science with SAS: A Hands-On Programming Guide, I use the 1.5 IQR rule to adjust multiple variables. This program utilizes a macro that loops through a list of variables to make the necessary adjustments and creates an output data set. One of the most […]
Adjusting outliers with the 1.5 IQR rule was published on SAS Users.
While working at the Rutgers Robert Wood Johnson Medical School, I had access to data on over ten million visits to emergency departments in central New Jersey, including ICD-9 (International Classification of Disease – 9th edition) codes along with some patient demographic data. I also had the ozone level from […]
Using SAS to estimate the link between ozone and asthma (and a neat trick) was published on SAS Users.
If you have been using SAS for long, you have probably noticed that there is generally more than one way to do anything. (For an example, see my co-author Lora Delwiche’s blog about PROC SQL.) The Little SAS Book has long covered reading and writing Microsoft Excel files with the […]
Accessing Excel files using LIBNAME XLSX was published on SAS Users.
In case you missed the news, there is a new edition of The Little SAS Book! Last fall, we completed the sixth edition of our book, and even though it is actually a few pages shorter than the fifth edition, we managed to add many more topics to the book. […]
Test your SAS skills with the newest edition of Exercises and Projects for The Little SAS Book was published on SAS Users.