Training materials
Authors: Hadley Wickham
and Contributors: Björn Grüning or Carolyn Hogg or Fotis E. Psomopoulos or Hadley Wickham or Ray Sajulga
Authors: Hadley Wickham
and Contributors: Björn Grüning or Carolyn Hogg or Fotis E. Psomopoulos or Hadley Wickham or Ray Sajulga