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Free course

R for data analysis, taught in your browser

Six short lessons take you from your first R command to running t-tests, ANOVA, correlation, and regression on real data. Every example runs instantly in the built-in playground: nothing to install, no account required.

  1. William Playfair’s 1786 time-series chart of England’s trade balance, rendered in navy duotone1

    Getting started with R

    What R is, why researchers use it, and your first working session: vectors, data frames, and the built-in datasets you will practice on. Runnable in your browser.

    12 min

  2. Florence Nightingale’s 1858 rose diagram of army mortality causes, rendered in navy duotone2

    Descriptive statistics in R

    Compute means, standard deviations, medians, frequencies, and group summaries in R with mean(), sd(), summary(), table(), and aggregate(). Runnable examples included.

    14 min

  3. Portrait of William Sealy Gosset, who published the t-test as “Student”, rendered in navy duotone3

    t-tests in R

    Run one-sample, independent-samples, and paired t-tests in R with t.test(), read the output, and report the result in APA style. Runnable examples included.

    15 min

  4. Portrait of Ronald Fisher, who developed the analysis of variance, rendered in navy duotone4

    One-way ANOVA in R

    Compare three or more group means in R with aov(), read the F table, follow up with TukeyHSD(), and report the result in APA style. Runnable examples included.

    15 min

  5. Portrait of Francis Galton, who introduced correlation and regression, rendered in navy duotone5

    Correlation and regression in R

    Measure association with cor.test(), fit a linear regression with lm(), and interpret coefficients, p-values, and R-squared. Runnable examples included.

    16 min

  6. John Snow’s 1854 cholera map of Soho, rendered in navy duotone6

    Plots in R with base graphics

    Draw histograms, box plots, and scatter plots with a fitted line in base R, and label them properly for a paper. Runnable examples included.

    12 min

Or just start typing code

The playground runs real R and Python in your browser via WebAssembly. Open it in a second tab while you work through the lessons.

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Lesson images are public-domain works from Wikimedia Commons, retinted. KyroStat is an AI-assisted statistics workspace: see how it works.

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