• "RStudio is an integrated development environment (IDE) for R."
• It helps the user use R.
• R, in essence is just the a console that takes commands from you typing into it
• Is NOT dropdown statistical tools (such as Stata)
• Snapshots taken from http://ayeimanol-r.net/2013/04/21/289/

• Where code is executed (where things happen)
• You can type here for things interactively
• Code is not saved on your disk

• Where files open to
• Have R code and comments in them
• Can highlight and press (CMD+Enter (Mac) or Ctrl+Enter (Windows)) to run the code
• Code is saved on your disk

Workspace/Environment

• Tells you what objects are in R
• What exists in memory

History

• Shows previous commands. Good to look at for debugging, but don't rely on it as a script. Make a script!

• Files - shows the files on your computer of the directory you are working in
• Viewer - can view data or R objects
• Help - shows help of R commands
• Plots - pretty pictures

• Packages - list of R packages that are loaded in memory
  • Packages are a set of functions written by R users
  • We write packages - some are good, some are not so good
• Think of them as "R Extensions"
• If they extend R, when you download R from CRAN, we (and others) refer to things as "base R"
  • We will show you how to do some things in base R, but also show you some newer (and more intuitive) ways to do things
  • You need base R, however, because when you Google for answers, they are commonly answered without any additional packages.

• Previous Assistant Professor of Statistics at Rice University
• Writes many R packages
• One authority on all things R
• Employee and Developer at RStudio
• I (John) trust almost all his packages
  • How to trust an R package: http://simplystatistics.org/2015/11/06/how-i-decide-when-to-trust-an-r-package/