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Analytics | Learn SAS
Rick Wicklin 0
What is Kolmogorov's D statistic?

Have you ever run a statistical test to determine whether data are normally distributed? If so, you have probably used Kolmogorov's D statistic. Kolmogorov's D statistic (also called the Kolmogorov-Smirnov statistic) enables you to test whether the empirical distribution of data is different than a reference distribution. The reference distribution

Data Visualization | Learn SAS | SAS Events
Scott Hicks 0
Why Maps matter: Lessons learned from London's 1854 Cholera outbreak

The catch phrase “everything happens somewhere” is increasingly common these days.  That “somewhere” translates into a location on the Earth; a latitude and longitude.  When one of these “somewhere’s” is combined with many other “somewhere’s”, you quickly have a robust spatial data set that becomes actionable with the right analytic

Learn SAS | Programming Tips
Rick Wicklin 0
Convergence in mixed models: When the estimated G matrix is not positive definite

I've previously written about how to deal with nonconvergence when fitting generalized linear regression models. Most generalized linear and mixed models use an iterative optimization process, such as maximum likelihood estimation, to fit parameters. The optimization might not converge, either because the initial guess is poor or because the model

Data for Good | Learn SAS | Students & Educators
Sian Roberts 0
Breaking down walls for science: SAS Press donates books to the world’s largest research methods library

In a move to combat "stataphobia" and foster excellence in statistics in developing countries, SAS Press last month donated 70 SAS Press titles to the Serageldin Research Library at the Library of Alexandria in Egypt. The library’s mission is to achieve statistical equity so that a student in Chad has

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