Notes on statistical practice, predictive modeling, dashboards, and the craft of analytical work — by Brian Cervantes Alvarez.https://epsilon-labs.org/en-ushttps://epsilon-labs.org/blog/data-fest-2025-effective-data-visualizations/https://epsilon-labs.org/blog/data-fest-2025-effective-data-visualizations/A practical guide to picking and designing high-impact visualizations under the time pressure of ASA DataFest.Thu, 03 Apr 2025 00:00:00 GMTData vizhttps://epsilon-labs.org/blog/quarto-github-pages-preworkshop/https://epsilon-labs.org/blog/quarto-github-pages-preworkshop/Install checklist for attendees of a Quarto + GitHub Pages workshop — Git, GitHub, PATs, RStudio.Wed, 29 Jan 2025 00:00:00 GMTQuartohttps://epsilon-labs.org/blog/interactive-teaching-with-webr/https://epsilon-labs.org/blog/interactive-teaching-with-webr/Run live R in the browser, no install required — and rebuild your data-wrangling lab around immediate feedback.Mon, 12 Aug 2024 00:00:00 GMTStatistics Labhttps://epsilon-labs.org/blog/predicting-patient-severity-machine-learning/https://epsilon-labs.org/blog/predicting-patient-severity-machine-learning/Python Random Forest mapping symptom flags to mild / moderate / severe ratings, with extracted rules for clinician review.Mon, 26 Jun 2023 00:00:00 GMTMLhttps://epsilon-labs.org/blog/predicting-salaries-machine-learning/https://epsilon-labs.org/blog/predicting-salaries-machine-learning/Team ML project on the OpenML census data — PCA feature selection plus a tuned Random Forest reaching kappa 0.95.Tue, 11 Apr 2023 00:00:00 GMTMLhttps://epsilon-labs.org/blog/predicting-customer-returns-machine-learning/https://epsilon-labs.org/blog/predicting-customer-returns-machine-learning/Feature-engineered Random Forest that lifted return prediction from AUC 0.625 to 0.98 on retail data.Sat, 11 Mar 2023 00:00:00 GMTMLhttps://epsilon-labs.org/blog/predicting-wine-province-machine-learning/https://epsilon-labs.org/blog/predicting-wine-province-machine-learning/NLP-flavored Random Forest that infers a Pinot Noir's province of origin from a critic's tasting notes.Wed, 01 Mar 2023 00:00:00 GMTMLhttps://epsilon-labs.org/blog/united-states-healthcare-spending-statistical-analysis/https://epsilon-labs.org/blog/united-states-healthcare-spending-statistical-analysis/Longitudinal analysis of U.S. healthcare expenditure by category, region, and state across 35 years.Mon, 12 Dec 2022 00:00:00 GMTStatisticshttps://epsilon-labs.org/blog/health-insurance-premiums-analysis/https://epsilon-labs.org/blog/health-insurance-premiums-analysis/Quantifying how smoking and BMI drive up insurance premiums by age and gender, in Python.Thu, 14 Jul 2022 00:00:00 GMTStatistics