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Free lessons teach you. Pro proves you — Prova checks your own code, and a shareable Skills Practice badge says so.
the runtime is the judge
See it run — before you decide
Live R
# Does the delivery method change tooth growth? Let the runtime decide.
tt <- t.test(len ~ supp, data = ToothGrowth)
boxplot(len ~ supp, data = ToothGrowth,
col = c("#e6f0fb", "#c9e0f6"), border = "#3a86d4",
xlab = "Supplement", ylab = "Tooth length",
main = "Tooth growth by supplement")
# jitter the raw points + mark the group means (publication style)
stripchart(len ~ supp, data = ToothGrowth, vertical = TRUE,
method = "jitter", add = TRUE, pch = 19, col = "#3a86d466")
means <- tapply(ToothGrowth$len, ToothGrowth$supp, mean)
points(seq_along(means), means, pch = 18, cex = 1.8, col = "#1e5fa8")
mtext(sprintf("Welch t-test: p = %.3f", tt$p.value), col = "#1e5fa8")
Nothing boots until you click — then this code runs for real, in your browser.
No setup, no upload. webR runs the analysis on your own machine and draws the plot — this is what “the runtime is the judge” means.
Pro
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Teams
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Included with Pro
Skills Practice — earn a badge by running code
Skills Practice — earn a shareable badge by running real code in Data Visualization, Biostatistics, Machine Learning, and Clinical Programming. Earned by doing, not clicking through videos.
- Data Visualization
- Biostatistics
- Machine Learning
- Clinical Programming
The runtime is the judge · earned, not granted
Preview a credential pathCompare plans
| What you get | Free | Pro | Teams |
|---|---|---|---|
| Every canonical lesson, free forever | |||
| Run the code live in your browser | |||
| Ask Prova (AI tutor) | Daily taste | Higher limits | Higher limits |
| Prova on your own code & data | |||
| Guided paths & real projects | |||
| Shareable Skills Practice badges | |||
| Offline book (PDF / ePub) | |||
| Ad-free reading | |||
| Team admin, seats & progress | |||
| Invoicing & priority support |
180 reviews of our 8 books
What readers say about the books behind these lessons
4.52out of 5
- 5 stars: 121 reviews, 67.2%
- 4 stars: 44 reviews, 24.4%
- 3 stars: 8 reviews, 4.4%
- 2 stars: 1 review, 0.6%
- 1 star: 6 reviews, 3.3%
92% rated 4 stars or better, across our 8 books.
My field is functional genomics, and i have found this site just recently. This is an absolutely terrific resource for cluster analysis using R. Great way to get some insights into ggplot2 too. Thank you very much!Datanovia website is really incredible. They understand the tools relevant to modern advanced scientific analysis--but teach it at the level of someone trying to build these skills from scratch. Incredible attention to detail.Datanovia is excellent, it’s extremely useful. It boasts very good techniques, elegant codes, and is well-written and organised. It’s one of the best of its kind.Frequently asked questions
Why pay, when the lessons are free?
Because reading isn't doing. Pro is where you apply it to your own data — with Prova running every answer, real projects to build, and a certificate that proves the skill. It's the loop a generic chatbot can't close: the runtime is the judge.
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