Training materials
Difficulty level: Not specified
and Authors: Allegra Via or Dave Clements or Hadley Wickham or Janick Mathys
and Contributors: Anthony Bretaudeau or Hadley Wickham
Difficulty level: Not specified
and Authors: Allegra Via or Dave Clements or Hadley Wickham or Janick Mathys
and Contributors: Anthony Bretaudeau or Hadley Wickham