Stats / Data

Statistics, data analysis, and related tools.

Benchmark

AI Model Benchmarks Compare AI model benchmark scores, context limits, open-weight availability, and provider prices with source-linked evidence.

Accuracy Calculator Calculate classification accuracy from true and false outcome counts.
Balanced Accuracy Calculator Calculate the mean of sensitivity and specificity.
F1 Score Calculator Calculate the harmonic mean of classification precision and recall.
Precision Calculator Calculate positive predictive value from true and false positive counts.
Recall Calculator Calculate sensitivity from true positive and false negative counts.
Specificity Calculator Calculate true negative rate from true negative and false positive counts.

Archetypal Analysis Demonstrator Approximate multivariate observations as convex mixtures of archetypes that are themselves mixtures of the observations.

Bloom Filter Calculator Build a deterministic Bloom filter, test an item, and estimate its false-positive probability.

Particle Filter Estimator Estimate a one-dimensional hidden state with a reproducible bootstrap particle filter.

Bayesian Rule List Demonstrator Apply an ordered probabilistic rule list using beta-binomial posterior predictions.

Feedforward Neural Network Demonstrator Run one dense neural-network layer with selectable activation entirely in the browser.

Ridge Regression Demonstrator Fit a one-feature ridge regression with an unpenalized intercept.

SQLite REPL Run SQLite commands locally in your browser with tabular results and a database that persists for the current session.

Data Science Roadmap Learn statistics, data preparation, analysis, visualization, modeling, and responsible communication.

Progressive Tax Calculator Calculate marginal tax bands, total tax, and effective and marginal rates from an explicit bracket schedule.

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