Introduction to Reproducibility

• Goal - rerun full analysis with a single click (or command)
• First step - Make sure your code runs anywhere
• Important for class - your code has to run the on graders computer
• Important for science
  • next day (who has gotten code working & had it not work the next day?)
  • desktop vs. laptop
  • collaborators
  • advisor

Make sure things you did before don’t matter

• Computers store the results of each command run in sequence
• Change something
• Looks like it still works

• Only works because of something you did earlier in the same session

• Clear R environment using the broom icon on the Environment tab.
• Run entire file using Source button or Ctrl-Shift-Enter
• Makes sure that the code runs fully and produces desired result

Make sure code works on other computers

• Don’t use setwd()
  • Use projects and relative paths
  • data/mydata.csv not C:\Users\Batman\DataCarp\data\mydata.csv
• Write code that works on all operating systems
  • Assume case specificity
    • Filenames in code should match actual names exactly, including capitalization
  • Use / instead of \ or \\ in paths

Checklist

• There is an Assignment Turn In Checklist to help
• Show link on main page