When I was first learning R in a Coursera course from Johns Hopkins University, subsetting and filtering was one of the first things I learned how to do in R. Subsetting is essentially scaling down...

I use data frames nearly every time I write a script in R. I’m usually reading and storing the contents of several CSV files to process its contents. The more you work in R, the more you are likely...

One of the first things I struggled with when learning to write R code, was how to add a new column to a data frame in R. For example, we have a data frame, userdata, with the following three colu...

A data warehouse, distilled to its simplest form, is a database that contains different tables of data that do not change over time. Query and dashboarding tools can be placed on top of the data wa...