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, simulation, 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

Merge observed outcomes into a list of all outcomes

When you count the outcomes of an experiment, you do not always observe all of the possible outcomes. For example, if you roll a six-sided ... Read More

An easy way to use numbers for column headers

When I am computing with SAS/IML matrices and vectors, I often want to label the columns or rows so that I can better understand the ... Read More

The sensitivity of Newton's method to an initial guess

In my article about finding an initial guess for root-finding algorithms, I stated that Newton's root-finding method "might not converge or might converge to a ... Read More

Finding roots: Automating the search for an initial guess

A SAS programmer asked an interesting question on a SAS Support Community. The programmer had a nonlinear function with 12 parameters. He also had file ... Read More

Everything you wanted to know about writing SAS/IML modules

One of the fundamental principles of computer programming is to break a task into smaller subtasks and to modularize the program by encapsulating each subtask ... Read More

Execute SAS/IML statements that are in a file at run time

A feature of SAS/IML 13.2 (shipped with SAS 9.4m2, Aug 2014) is the ability to execute SAS/IML statements that are in a file. The feature ... Read More

The spiral of splatter

"Daddy, help! Help me! Come quick!" I heard my daughter's screams from the upstairs bathroom and bounded up the stairs two at a time. Was ... Read More

Computing polar angles from coordinate data

Equations that involve trigonometric functions can have infinitely many solutions. For example, the solution to the equation tan(θ)=1 is θ = π/4 + kπ, where ... Read More

Fit a circle to data

I still remember the first time I was asked to "consult" on a statistical problem. A former physics professor had some students who had gathered ... Read More

The mystery of the density curve that was too short

I was reading a statistics book when I encountered a histogram that caught my eye. The histogram looked similar to the one at the left. ... Read More