See how to join two data sets by one or more common columns using base R’s merge function, dplyr join functions, and the speedy data.table package. R has a number of quick, elegant ways to join data ...

Have you ever faced the frustration of trying to combine multiple Excel files, only to realize their sheet names don’t match? It’s a common headache for anyone working with data from varied sources.

Part Two of this three-part article covers how to import your Outlook contact list—the CSV file—into Excel, then how to refine, maintain, and manage that database so, in Part Three, you can merge it ...