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How to make a great R reproducible example?

When discussing performance with colleagues, teaching, sending a bug report or searching for guidance on mailing lists and here on SO, a reproducible example is often asked and always helpful.

This begs certain questions:

  • What are your tips for creating an excellent example?
  • How do you paste data structures from in a text format?
  • What other information should you include?
  • Are there other tricks in addition to using dput(), dump() or structure()?
  • When should you include library() or require() statements?
  • Which reserved words should one avoid, in addition to c, df, data, etc?

Or, simply: How does one make a great reproducible example?

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