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

The Wishart distribution: Covariance matrices for multivariate normal data

I've written about how to generate a sample from a multivariate normal (MVN) distribution in SAS by using the RANDNORMAL function in SAS/IML software. Last ... Read More

Overview of new features in SAS/IML 13.1

SAS software contains a lot of features, and each release adds more.To make sure that you do not miss new features that appear in the ... Read More

Resampling and permutation tests in SAS

My colleagues at the SAS & R blog recently posted an example of how to program a permutation test in SAS and R. Their SAS ... Read More

What is the coefficient of variation?

I sometimes wonder whether some functions and options in SAS software ever get used. Last week I was reviewing new features that were added to ... Read More

The difference between RUN and CALL for SAS/IML subroutines

Have you ever noticed that some SAS/IML programmers use the CALL statement to call a subroutine, whereas others use the RUN statement? Have you ever ... Read More

The distribution of Pythagorean triples

When I studied high school geometry, I noticed that many homework problems involved right triangles whose side lengths were integers. The canonical example is the ... Read More

An efficient way to increment a matrix diagonal

I was recently asked about how to use the SAS/IML language to efficiently add a constant to every element of a matrix diagonal. Mathematically, the ... Read More

The distribution of blood types by country

My colleague Robert Allison has a knack for finding fascinating data. Last week he did it again by locating data about how blood types and ... Read More

Binning data by quantiles? Beware of rounded data

In my article about how to create a quantile plot, I chose not to discuss a theoretical issue that occasionally occurs. The issue is that ... Read More

Recent additions to the SAS/IML file exchange

It has been three months since the introduction of the SAS/IML File Exchange, so I thought I'd give a short update on recent submissions and ... Read More