Test Your R Knowledge — Easy, Medium & Hard

Three free interactive R quizzes — easy, medium and hard. Answer multiple-choice questions on R basics, data frames, vectors and gotchas, and get instant feedback with an explanation for every answer. No sign-up, runs in your browser.

How well do you know R? Pick a level below and answer the questions — you get instant feedback and a short explanation on every answer, plus a score at the end. Nothing is uploaded; it all runs in your browser. New to R? Start with our free Learn R course and come back.

Easy

Medium

Hard

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Want to turn a red answer green? Learn interactively — every page runs real R in your browser:

• Learn R — the essentials, one runnable lesson at a time.
• R playground — a free R console, plus real datasets.
• Biostatistics in R guide — the whole map, from tests to reporting.

Building something serious in R and want it done right? That’s what we do.