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

Create patterns of missing data

When simulating data or testing algorithms, it is useful to be able to generate patterns of missing data. This ... Read More

Ahh, that's smooth! Anti-aliasing in SAS statistical graphics

I've written several articles about scatter plot smoothers: nonparametric regression curves that reveal small- and large-scale features of a ... Read More

Loess regression in SAS/IML

A previous post discusses how the loess regression algorithm is implemented in SAS. The LOESS procedure in SAS/STAT software ... Read More

What is loess regression?

Loess regression is a nonparametric technique that uses local weighted regression to fit a smooth curve through points in ... Read More

The empty-space distance plot

How far away is the nearest hospital? How far is the nearest restaurant? The nearest gas station? These are ... Read More

WHERE operators in SAS: Multiple comparisons and fuzzy matching

The WHERE clause in SAS is a powerful mechanism for selecting observations as you read or write a data ... Read More

Visualize a weighted regression

What is weighted regression? How does it differ from ordinary (unweighted) regression? This article describes how to compute and ... Read More

Let PROC FREQ create graphs of your two-way tables

The recent releases of SAS 9.4 have featured major enhancements to the ODS statistical graphics procedures such as PROC ... Read More

Distances between observations in two groups

Last week I showed how to find the nearest neighbors for a set of d-dimensional points. A SAS user ... Read More

Create an ogive in SAS

My son is taking an AP Statistics course in high school this year. AP Statistics is one of the ... Read More