Visualizations

Interactive tools for building intuition about statistical concepts.

• Cohen's d Effect size and the overlap between two distributions.
• Correlation What a correlation coefficient looks like as a scatter.
• Likelihood Maximum likelihood estimation and the likelihood ratio, Wald, and score tests.
• Adjusted coefficients Why adjusted regression coefficients are less descriptive than they look.
• PowerLMM.js Sample size planning for longitudinal models with missing data.
• p-values How p-values relate to statistical power.
• Therapist effects How clustering by therapist shifts treatment-effect estimates.
• Statistical power and significance testing The classic Type I and Type II error illustration, made interactive.
• Confidence intervals Simulate confidence intervals and watch how often they cover.
• Bayesian inference How prior and likelihood combine into the posterior.
• Equivalence and non-inferiority testing Superiority, non-inferiority, and equivalence read off one confidence interval.
• p-value distribution The expected distribution of p-values under different alternatives.
• t-distribution Compare the t-distribution with the normal distribution.