10 posts from 2019 that deserve a second look


Did you add "learn something new" to your list of New Year's resolutions? Last week, I wrote about the most popular articles from The DO Loop in 2019. The most popular articles are about elementary topics in SAS programming or univariate statistics because those topics have broad appeal.

Advanced topics and multivariate statistics are less popular but no less important. If you want to learn something new, check out this "Editor's Choice" list of articles that will broaden your statistical knowledge and enhance your SAS programming skills. I've grouped the articles into three broad categories.

Regression statistics

Schematic diagram of outliers in bivariate normal data. The point 'A' has large univariate z scores but a small Mahalanobis distance. The point 'B' has a large Mahalanobis distance. Only 'b' is a multivariate outlier.

High-dimensional analyses and visualization:

Low-dimensional data visualization

The tips and techniques in these articles are useful, so read a few articles today and teach yourself something new in this New Year!

Do you have a favorite article from 2019 that did not make either list? Share it in a comment!


About Author

Rick Wicklin

Distinguished Researcher in Computational Statistics

Rick Wicklin, PhD, is a distinguished researcher in computational statistics at SAS and is a principal developer of SAS/IML software. 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.


  1. Hi Rick,

    When PROC PLM is used for the EFFECTPLOT statement, after RESTORing the STOREd data set from PHREG, I get the message that the EFFECTPLOT statement cannot be used for the specified model.

    • Rick Wicklin

      Yes. The EFFECTPLOT statement is designed to visualize generalized linear models. I believe the procedures that EFFECTPLOT does not support are

      PROC LOGISTIC with a STRATA statement (conditional logistic regression).
      The effect plot for the MIXED procedure only supports the fixed effects.
      The RELIABILITY procedure in SAS/QC (but you can use the EFFECTPLOT statement in the procedure).

      These are the ones I know about. I've asked the developer to add this list to the documentation for the EFFECTPLOT statement.

Leave A Reply

Back to Top