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Programming Tips

Strengthen your programming skills with tips and techniques from the experts

Rick WicklinJuly 20, 2020 0

Compute within-group multivariate statistics and store them in a list

I recently showed how to compute within-group multivariate statistics by using the SAS/IML language. However, a principal of good software design is to encapsulate functionality and write self-contained functions that compute and return the results. What is the best way to return multiple statistics from a SAS/IML module? A convenient

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Advanced Analytics | Programming Tips

Rick WicklinJuly 15, 2020 0

How to evaluate the multivariate normal log likelihood

The multivariate normal distribution is used frequently in multivariate statistics and machine learning. In many applications, you need to evaluate the log-likelihood function in order to compare how well different models fit the data. The log-likelihood for a vector x is the natural logarithm of the multivariate normal (MVN) density

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Programming Tips

James GearheartJuly 14, 2020 0

Adjusting outliers with the 1.5 IQR rule

In my new book, End-to-End Data Science with SAS: A Hands-On Programming Guide, I use the 1.5 IQR rule to adjust multiple variables. This program utilizes a macro that loops through a list of variables to make the necessary adjustments and creates an output data set. One of the most

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