ab_tests.qwer · 1.0.0A/B tests from start to end: variants that stay each user's, the visitors needed, and whether a difference is real by z-test, Welch's t-test, chance to win and a sample ratio check.7 views · 8 downloadsAnomaly detection anomalies.qwer · 1.0.0Outliers and odd moments found in numbers: z-scores, the robust MAD score, IQR fences and Grubbs' test; and in series over time, spikes against a rolling window or the same hour of past days, EWMA control limits and level shifts by CUSUM.8 views · 8 downloadsClustering clustering.qwer · 1.0.0Data put into groups: k-means with k chosen by the elbow and silhouette, DBSCAN for groups of any shape and their outliers (in metres for latitude and longitude), and hierarchical clustering, on rows of numbers or maps.7 views · 7 downloadsFair rankings rankings.qwer · 1.0.0Lists ranked fairly: votes by the Wilson score, star ratings by a Bayesian average or a Dirichlet score so a few votes do not win, hot lists as Reddit and Hacker News rank them, time decay, trending counts, and ties ranked together.6 views · 6 downloadsForecasting forecast.qwer · 1.0.0Forecasts from a series of numbers: moving averages, exponential smoothing, Holt's trend and Holt-Winters seasons with their weights fitted, the best model chosen on held-out data, prediction intervals, and accuracy measures.8 views · 9 downloadsMatrices matrix.qwer · 1.0.0Matrices as lists of rows: linear systems solved, inverses, determinants, products and transposes, and least-squares fits such as a trend line.7 views · 8 downloadsRandom distributions random_dist.qwer · 1.0.0Seeded samples from normal, log-normal, Poisson, exponential and binomial distributions, with a summary, for simulations and test data.7 views · 9 downloadsStatistical tests statistics.qwer · 1.0.0Statistical tests and regression beyond Quillo's stats: t-tests (one-sample, paired, Welch), ANOVA, chi-square tests, Mann-Whitney U, correlation with its p-value, confidence intervals, and multiple linear regression with standard errors and p-values.7 views · 7 downloadsOther tags
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