Rick Wicklin
Rick Wicklin RSS
Research Statistician Developer

Rick Wicklin, PhD, is a distinguished researcher in computational statistics at SAS and is a principal developer of PROC IML and SAS/IML Studio. His areas of expertise include computational statistics, statistical graphics, and modern methods in statistical data analysis. Rick is author of the books Statistical Programming with SAS/IML Software and Simulating Data with SAS. Follow @RickWicklin on Twitter.

Recent Posts

Counting observations in two-dimensional bins

Last Monday I discussed how to choose the bin width and location for a histogram in SAS. The height of each histogram bar shows the ... Read More

Choosing bins for histograms in SAS

When you create a histogram with statistical software, the software uses the data (including the sample size) to automatically choose the width and location of ... Read More

Analyzing activity-tracker data: How many steps per day do YOU take?

My wife got one of those electronic activity trackers a few months ago and has been diligently walking every day since then. At the end ... Read More

Creating heat maps in SAS/IML

In a previous blog post, I showed how to use the graph template language (GTL) in SAS to create heat maps with a continuous color ... Read More

Creating a basic heat map in SAS

Heat maps have many uses. In a previous article, I showed how to use heat maps with a discrete color ramp to visualize matrices that ... Read More

Guiding numerical integration: The PEAK= option in the SAS/IML QUAD subroutine

One of the things I enjoy about blogging is that I often learn something new. Last week I wrote about how to optimize a function ... Read More

Ten tips for learning the SAS/IML language

A SAS customer wrote, "Now that I have access to PROC IML through the free SAS University Edition, what is the best way for me ... Read More

Define an objective function that evaluates an integral in SAS

The SAS/IML language is used for many kinds of computations, but three important numerical tasks are integration, optimization, and root finding. Recently a SAS customer ... Read More

Stigler's seven pillars of statistical wisdom

Wisdom has built her house; She has hewn out her seven pillars.      – Proverbs 9:1 At the 2014 Joint Statistical Meetings in Boston, Stephen Stigler ... Read More

Reversing the limits of integration in SAS

In SAS software, you can use the QUAD subroutine in the SAS/IML language to evaluate definite integrals on an interval [a, b]. The integral is ... Read More