Properties of the elements
Datasets usually provide raw data for analysis. This raw data often comes in spreadsheet form, but can be any collection of data, on which analysis can be performed.
The raw file (RData binary format, use R's load() function to open) contains the properties of the elements, scraped from periodictable.com.
The element-data.rda contains cleaned-up database of elemental properties, easily accessible for anyone with a working R install.
The blog post in the link below describes how to use this file (see the MWE section).
The csv files are ascii-formatted versions of the rda file's content.