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

Simultaneous confidence intervals for a multivariate mean

Many SAS procedure compute statistics and also compute confidence intervals for the associated parameters. For example, PROC MEANS can ... Read More

Discover power laws by log-transforming data

A recent issue of Astronomy magazine mentioned Kepler's third law of planetary motion, which states "the square of a ... Read More

Append data to add markers to SAS graphs

Do you want to create customized SAS graphs by using PROC SGPLOT and the other ODS graphics procedures? An ... Read More

Goodness-of-fit tests: A cautionary tale for large and small samples

In the classic textbook by Johnson and Wichern (Applied Multivariate Statistical Analysis, Third Edition, 1992, p. 164), it says: ... Read More

Sampling variation in small random samples

Somewhere in my past I encountered a panel of histograms for small random samples of normal data. I can't ... Read More

Highlight forecast regions in graphs

A SAS customer asked how to use background colors and a dashed line to emphasize the forecast region for ... Read More

Need to log-transform a distribution? There's a SAS function for that!

At a conference last week, a presenter showed SAS statements that compute the logarithm of a probability density function ... Read More

Visualize the ages of US presidents

Who was the oldest person elected president of the United States? How about the youngest? Who was the oldest when ... Read More

One informat to rule them all: Read any date into SAS

If you obtain data from web sites, social media, or other unstandardized data sources, you might not know the ... Read More

Visualize a torus in SAS

This article uses graphical techniques to visualize one of my favorite geometric objects: the surface of a three-dimensional torus. ... Read More