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Learn statistics by playing with it.
Drag sliders, draw samples, break assumptions and see what happens. 34 hands-on lessons from the mean to neural networks, every number computed live and checked against standard statistical software.
34
interactive lessons
34
topic quizzes
0/34
explored by you
Try these first
Six favourites — each takes about five minutes and teaches one big idea.
Guess the correlation
How good is your eye for r? Play a few rounds and get scored.
Central Limit Theorem machine
Draw thousands of samples from a skewed population and watch a bell curve emerge.
100 confidence intervals
See what “95% confident” actually promises — and when it breaks.
Beat least squares
Fit a line by hand and see if you can beat the computer’s sum of squares.
Click-to-learn GP
Add points with your mouse and watch the uncertainty band shrink.
Neural network playground
Train a small network on spirals and moons and watch it learn.
The learning path
Six stages, roughly in the order a statistics course would cover them. Jump in anywhere.
Stage 1
Basic Concepts
Central Tendency · Variability · Probability & Bayes' Rule · Correlation
Stage 2
Probability Distributions
Normal Distribution · Binomial Distribution · Poisson Distribution · Central Limit Theorem · t-Distribution
Stage 3
Statistical Inference
Confidence Intervals · Hypothesis Testing & Power · One-Sample t-Test · Two-Sample t-Test · Paired t-Test · One-Way ANOVA · Chi-Square Tests · Effect Sizes
Stage 4
Regression Analysis
Simple Linear Regression · Multiple Regression · Polynomial Regression · Logistic Regression · Model Diagnostics
Stage 5
Advanced Methods
Bootstrap Methods · Non-parametric Tests · Time Series (ARIMA) · PCA · Bayesian Inference
Stage 6
Machine Learning
K-Means Clustering · Decision Trees · Random Forest · Support Vector Machines · Splines & Smoothing · Gaussian Processes · Neural Network Playground
1. Play
Every lesson starts with something to touch: sliders, buttons, points you can click.
2. Read
Open the theory panel when you want the formulas and the “why”.
3. Check
Finish with a short quiz. Your progress is saved in this browser only.