![Repetition factors versus frequency variables](https://blogs.sas.com/content/iml/files/2017/01/AdvancedAnalytics-1.png)
A regular reader noticed my post on initializing vectors by using repetition factors and asked whether that technique would be useful to expand data that are given in value-frequency pairs. The short answer is "no." Repetition factors are useful for defining (static) matrix literals. However, if you want to expand